Air Handling Units Catalogue

Introduction

Contents
Introduction ..................................... 2
Legend ............................................ 2
Nomenclature .................................. 2
General Features ............................ 3
Component Features ...................... 3
Sections & Sub Assemblies ............. 4
Units for Outdoor Installation ........... 8
Accessories & Options .................... 8
Quick Selection ............................... 9
Motor Data ...................................... 9

Capacity Ratings ........................ 10,11
Air Pressure Drop ....................... 12
Fan Performance ....................... 13
Dimensional Data ....................... 14,15
Base Frame Details .................... 16
Coil Connection Sizes ................ 16
Coil Connection Locations ......... 17
Weights ...................................... 18,19
Guide Specifications ................... 20

Legend
The following legends are used
throughout this manual :
Amp ............. Amperes
cfm .............. Cubic feet per minute
DBT ............. Dry Bulb Temperature
EAT ............. Entering Air Tempeature
ESP ............. External Static Pressure
EWT ............ Entering Water Temp.
FPI ............... Fins per inch
fpm .............. Feet per minute
gpm ............. Gallons per minute
inwg ............. inches of Water Gauge
Hz ................ Hertz
KW .............. Kilowatts

Kg ................ Kilgrams
KPa ............. Kilo Pascals
lbs ................ Pounds weight
l/s ................. Litres per second
LWT ............ Leaving Water Temp.
MBH ............ 1000 Btuh
m/s .............. Meters per second
OD ............... Outside Diameter
Pa ................ Pascals
Ph ................ Phase
psig .............. pounds per sq.inch
rpm .............. revolutions per minute
SST ............. Saturated Suction Temp.
V .................. Volts
WBT ............ Wet Bulb Temperature

Nomenclature
MAH
Modular Air Handling Unit

12
Nominal Air Flow Rate (cfm) / 100

MAH - Series
Page 2

SKM Modular Air Handling (MAH) Units
are designed to a high engineering
standard to provide the requirements of
ventilation, heating, cooling, dehumidification and air distribution to a
conditioned space.
MAH Units are available in 16 sizes to
deliver from 1200 cfm (566 l/s) to 45,000
cfm (21240 l/s) nominal air flow rate
against total static pressure upto 8.0 inwg.
(2000 Pa). MAH units are applicable for
indoor and outdoor installation and they
are ideal for large halls, schools, offices,
banks, workshops, laboratories,
restaurants, cinemas, hospitals,
departmental stores, mosques and super
markets, etc.
SKM double skin air handling units are
designed to meet the Indoor Air Quality
requirements as per ARI standard 62/89.
SKM Modular Air Handling Units, are
another premium international quality
product from SKM, rated in accordance
with ARI standard 430 and fully justifying
our slogan :

Built in the Gulf...for the World

GENERAL FEATURES
COMPONENT FEATURES
Internal skin

General Features
SKM MAH units are manufactured in modular sections. Units can
be shipped fully or partially assembled to facilitate handling and
lifting in case of limited access. All components of MAH are easily
accessible. Different sectional arrangements & fan discharge
positions are possible depending on the site constraints and
requirements. MAH units are suitable both for duct connection or
free discharge applications.
A typical MAH Unit consists of a wide choice of a combination but
not limited to the following sections, fan, cooling coil, heating coil,
humidifier, filter section, heat recovery system, by-pass section,
multi-zone, mixing box dampers, return air fan, plenums etc.

Inner panel skin, so called “double skin” [DSU] to retain the
insulation, is made of galvanized steel, is easy to clean and has
smooth surface. This eliminates any chance of dirt and bacteria
accumulation, making SKM double skin units ideally suitable for
hygienic applications, such as, pharmaceutical industries,
hospitals, operation theatres and food processing industries, etc.
Stainless steel inner skin [SIS] or perforated inner skin [PIS] or
Aluminium inner skin [AIS] for better sound absorption
characteristics are available as an option.

Painting

Casing & Construction

MAH units are supplied unpainted in a galvanized finish. Units
are painted only when specified. Painted MAH units are made
out of a zinc coated galvanized steel thoroughly de-greased and
then phosphated before application of an average 60 micron
backed electrostatic polyester dry powder coating in RAL 7032
color scheme. This finish and coating can pass a 1000 hour, 5%
salt spray testing at 95°F (35°C) and 95% relative humidity as per
ASTM B 117-95. Specify option [BEP] for painted units.

Penta-Post Frame

Insulation

Component Features

MAH series section casings are constructed of framed modules
for maximum rigidity and strength. Structure frame is made of hot
dip coated galvanized steel profile so called “Penta-Post” which
has excellent mechanical characteristics. The cross section of this
profile is specially designed for this type of applications. “PentaPost” profiles are connected by means of special corner pieces.
This frame construction gives the possibility of completely
dismantling the unit sections and
re-assembly at site in
case of difficult access.

For best thermal and acoustical performance, all panels and PentaPost frames are internally insulated with fiberglass having black
glass tissue facing. The fiber glass insulation conforms to
HH-1-545B Type 1, SMACNA standard for duct liners and
ASTM-C-423 and NFPA90A and 90B standards for fire resistance.
Sound absorption coefficients tested in accordance with
ASTMC423 on F25 mounting are as follows :
Octave Band (Hz)

125

250

500

1000 2000 4000 NRC

Coefficient

0.23

0.47

0.57

0.74

0.85

0.86

0.6

Special gaskets are provided for thermal bridge protection to avoid
condensation. MAH comes standard with 1” (25mm) insulation
for sizes 12-150 and with 1.5” (38mm) for sizes 200-450. The
density and thermal conductivity of standard insulation is 2 lb/ft³
(32kg/m³) and 0.23 BTU.in/ft².°F.h, (0.033 W/m°K) respectively.
The following are the optional insulation materials available in MAH
units :
•

2” (50mm) fiber glass insulation, [2SG] with the same
zspecifications as standard.

•

1” (25mm) or 2” (50mm) polyisocynurate board, [1SB] or
[2SB] with density in the range of 2 to 3 lb/ft³ (32 to 48 kg/
m³) and thermal conductivity of 0.16 BTU.in /ft².°F.h (0.023
W/m°K).

•

1” (25mm) or 2” (50mm) polyurethane foam injection or board,
[1SF] or [2SF] with density in the range of 2 to 3 lb/ft³ (32 to
48 kg/m³) and thermal conductivity of 0.16 BTU.in/ft².°F.h
(0.023 W/m°K). The injection is only possible for double skin
units.

Panels
Access and fixed panels are constructed of hot dip galvanized
steel conforming to JIS-G 3302 and ASTM-A-653. Access panels
are provided with quick release fasteners to facilitate access to all
internal components for maintenance and service. Suitable
handles are provided for ease of handling.
All fixed panels are bolted to the frame and provided with special
gasket between panels and frames to ensure air tightness. This
bolted construction makes all sections accessible from both sides.

MAH - Series
Page 3

SECTIONS & SUB ASSEMBLIES
Base Frame
Since MAH is constructed from Pentapost profile, which has
inherent rigidity and stability. Most sizes of MAH series (up to size
100) do not require structure steel base frame. Sheet metal frame
with holes for vibration mounts are provided on each side of the
unit. For larger MAH units (sizes 120 - 450), a steel structure is
provided coated with galvanized primer and black enamel finish.
Structural steel base frame, [SBF] for sizes 12 - 100 is available
as an option. See page 16 for details.

floating sub base. In order to limit transmission of noise and
vibration the complete fan motor sub-base assembly is mounted
on anti-vibration mounts and, therefore, it is not necessary to install
external vibration mounts. Flexible connection is provided between
fan discharge and casing panel to avoid transmission of vibration
to the connecting duct.
Motors can be provided on either right or left hand side facing the
unit from return air side (see figure). Section is sized to
accommodate different motor sizes depending on the actual
requirement of airflow and static pressure.

Major Sections & Sub Assemblies
MAH series is constructed of suitable sized casing module and
following sub-assemblies:

Fan Section
Fan
Double inlet double width centrifugal fans are standard supply in
SKM MAH. The impellers can have forward curved [FAT] or
[FADH], backward inclined [FRDH] or airfoil profile [FTZAF]
depending on the requirements. [FRDH] is available for sizes 32
to 450 and [FTZAF] is available for sizes 50 to 450. All fans are
belt-driven by motors with adjustable pitch motor pulleys and fixed
drive blower pulleys. The impellers are keyed to the shafts. All
fans are statically and dynamically balanced.
SKM fans uses self-aligned ball or pillow block bearings that are
greased for life. Pillow block bearings are provided with re-greasing
fittings. Shafts are made of C-40 steel turned by an automatic
process. Fans are selected for best sound characteristics based
on maximum fan efficiency. Fans used in SKM MAH units are
tested in a registered laboratory in accordance with AMCA
Standard 210. Different fan positions are available depending on
the requirement. Refer to dimensional data for details.

Motor Handing

Options
•

Non-standard fan size. [NSF]

•

Spark proof fans. [SPF]

•

Explosion proof motor. [EXM]

•
•

Variable speed drive (Frequency Inverter). [VSD]
Standby motor (additional) with manual change over. [MMC]

•

Stainless steel shaft. [SSS]

•

Extended lubrication fittings. [LFE]

•

Polyglycoat coating on fans. [PGF]

•

Spring vibration isolators for fan sub-frame. [FAVM]

•

Inlet guide vanes for VAV control FRDH & FRZR fans (size
50 & above). [IGV]

Coil Section
Variety of coils including chilled water [CCW] , direct expansion
[CDX], hot water [CHW] and steam [CST] are available to meet a
wide range of application requirements. Coils are assembled in
slide-in guides for easy removal for maintenance or replacement.
Coils are constructed from seamless copper tubes of 3/8”
(9.5 mm) OD for sizes 12-62 and 5/8” (15.9mm) OD for sizes 80450, arranged in a staggered form in the direction of airflow.

Motors
Fan motors are totally enclosed fan cooled (TEFC), foot mounted,
4 pole, IP-55 protected and Class-F insulated. The motor is
mounted on adjustable base, so that belt tension can be easily
adjusted. The complete fan motor drive assembly is mounted on

Copper tubes are mechanically expanded into continuous
corrugated aluminum fins, available in 8 fpi (3.2 mm), 10 fpi
(2.54 mm) and 12 fpi (2.1 mm) fin spacing to provide continuous
compression bond over the entire finned length for maximum heat
transfer rates.

MAH - Series
Page 4

SECTIONS & SUB ASSEMBLIES
Headers are made out of seamless copper pipe. The headers
joints are extruded to provide large bearing surface for maximum
strength. Air vents and drain plugs are standard for water coils.
Coils can be provided with moisture eliminator depending on the
air conditions. Eliminator blades are made of PVC, with shape
specially designed to trap water droplets blown off the coil. Please
specify [CCWE] & [CDXE] for chilled water and DX coils with
eliminator, respectively .
Cooling coil section is provided with insulated drain pan with MPT
drain connection, in order to hold and remove the condensate
formed during dehumidification. Drain pan is made of painted zinc
coated steel sheet. Coils are tested by air pressure while coils are
submerged in water to a pressure of300 psig (2060 kPa). SKM
coils are rated in accordance with ARI-410/91.

Coil Handing

Filter Section
Wide varieties of air filtration systems are available to choose from
depending on the requirement. These include :
Panel filters [FIPI] : 2” (50 mm) panel filters with aluminum
washable media or 2” (50 mm) fiberglass/synthetic
disposable/washable media. Average efficiency of filter ranges
from 62% to 95% average dust arrestance (gravimetric
measure) based on ASHRAE test # 52/76.
Vee filters [FIPV] : Filters arranged in a vee bank to increase
the filtration area. Media options are the same as in Panel
filters.

Coil Circuiting and Handing
Water coils can be provided with various coil circuiting like half,
full or double depending on the water flow rate and water pressure
drop through the coil.
Direct expansion coils are equipped with a properly sized distributor
to ensure equal refrigerant fed to all circuits. The number of circuits
is chosen to provide optimum heat transfer and reasonable
refrigerant velocity and pressure drop so as not to trap any oil in
the coil tubing. Coil connections can be provided on either right
or left hand side facing the unit from return air side (see figure).
Drain connection can be provided on either side or on both sides
as required. Inlet and outlet connections are sealed against unit
panel by means of flexible closed cell gaskets. SKM provides sweat
connections for coils as standard.

Bag Filter : 22” (559 mm) [FIBG1] , 30” (762 mm) [FIBG2]
or 36” (914 mm) [FIBG3] deep high efficiency bag filters with
average dust spot efficiency (opacimetric measure) ranging
from 75% to 95% as per ASHRAE test 52/76. Combination
of bag & flat filters are available under code [FIPBG1],
[FIPBG2] & [FIPBG3] corresponding to [FIBG1], [FIBG2] &
[FIBG3] respectively.
Consult SKM for equivalent efficiency to bag filter with short
depth, 4” thick (100 mm) extended surface minipleat filters
for cases where there are restrictions in dimension. This filter
is available in 65%, 85% and 95% dust spot efficiency.

Options
•
•
•
•
•
•
•

Copper fins. [FC]
Electro-tinned coils. [FCT]
Protective coating on coils. [PCC]
Stainless steel drain pan. [SDP]
MPT, FPT or flanged coil connectors. [PTA]
Expansion valve for direct expansion coils. [TXV]
Optional 5/8” OD Coils for models 12-62. [OTD]

MAH - Series
Page 5

SECTIONS & SUB ASSEMBLIES
HEPA Filter [FIHP] : Ultra high Absolute HEPA (High
Efficiency Particulate Air) filter with efficiency in excess of 99%
when measured by using DOP (Di-Octyle Phthalate) method.
Other varieties of filters like Auto Roll Filter [FIRL] and Sand
Inertia Filter [FISI] are also available.

Electric Heater Section
Two different types of electric heater element batteries are
available:

Humidifier Section
Various types of humidifiers are available depending on
application :
Steam humidifiers: Humidity is added in the form of steam. Two
types of steam humidifiers are available :
•

Internal steam humidifier [HSIG]. This section is complete
with steam pan with integral steam generator composed of
immersion type electric heater, tank and necessary controls.

•

External steam humidifier [HSEG ]. This section is empty,
only consisting of drain pan, steam distribution tubes and
hoses for steam distribution tubes. The steam generator is
remote to the unit.

Open Type [CEHO] : constructed from 80/20 nickel chrome
resistance elements.
Finned Type [CEHF] : constructed from 80/20 nickel chrome
resistance wire centered in stainless steel sheath metal tubes
by compressed magnesium oxide.
Electric heater batteries are available in a wide range of capacity
(KW) and steps. Electric heater batteries are supplied with primary
and secondary manual safety cutouts, as standard.
Recommended KW capacity on standard (nominal airflow) rate
is given in the table. Batteries other than this can be supplied
upon request.
Electric heater capacity in KW can be calculated in IP system as
:

Water humidifiers: Water humidifiers consist of water tank, pump,
spray nozzles, heat exchanger media and water droplet eliminator.
They are available in two different arrangements:
•

Evaporative Type [HFF] . This type consists of evaporative
flooded fill media. The air passing through the evaporative
media is humidified and cooled due to intensive contact
between air and the wetted & unheated contact surface. The
increase in humidity ratio occurs through water evaporation,
as air passes through media.

•

Spray Pad Type (Air Washer) [HPS] . In this type, water is
sprayed over the pad area. Air is humidified and cooled as it
passes through the wetted pad media.

Capacity (KW) = 1.085 x Airflow Rate (cfm) x Air Temperature Rise (°F)/3412

or in SI system as :
Capacity (KW) = 1.21 x Airflow Rate (l/s) x Air Temperature Rise (°C)/1000.

Model
Size
12
16
24
32
40
50
62
80
100
120
150
200
250
320
400
450

Option 1
6
7.5
12
15
18
24
30
36
48
60
72
90
126
144
189
216

Capacity (KW)
Stages
Option 2
1
9
1
12
1
18
2
24
2
27
2
36
2
45
2
54
2
72
2
84
2
108
2
144
3
180
4
225
3
270
6
324

The humidifying efficiency for water humidifiers can be calculated
using the following relation :

η humidifier =
Stages
2
2
2
2
3
2
3
3
4
4
3
4
5
5
5
6

=

Actual Moisture Content Change
Theoretical Moisture Content Change
Entering Dry Bulb Temp.- Leaving Dry Bulb Temp.
Entering Dry Bulb Temp.- Leaving Wet Bulb Temp.

Dampers
MAH units are equipped with multi blade, low leakage, heavy duty
dampers to control the air flow rate by introducing resistance to
air flow in the system. Dampers are available with parallel blades
and opposed blades. Links are provided for either manual or
motorized operation. The following dampers are available :
•
•
•

Options
Electric heater batteries [APHT] can be supplied as option with
control panels for remote installation or as an integral part of MAH
control panel consisting of stage contactors, control fuses, control
disconnect switch, terminals for field supply and installed air flow
switch and thermostat.

•

Full face air intake damper [DFC]
Face & bypass damper [DFBP]
Fresh, exhaust and return air damper for mixing box and
economizer control
Hot deck and cold deck dampers for multi-zone application.

The damper frame is constructed from galvanized steel, blades
from galvanized steel, shafts from steel, bearing from bronze and
linkage and brackets from galvanized steel. Aluminum damper
blades in airfoil profile are available, as an option.

MAH - Series
Page 6

SECTIONS & SUB ASSEMBLIES
are also available. A blow through dual duct [DDCT] can be
provided to meet the required application.

Sound Attenuator Section
Sound attenuator can be provided in both supply and return air
side. The standard design is with vertical specially designed
splitters consisting of sound absorbing material parallel to the air
stream matching unit cross section. Two different media depths
of 24” (600 mm) [SAT1] and 48” (1200 mm) [SAT2] are available
as standard.
A variety of splitter material, thickness, length, spacing and casing
are available in order to satisfy even the most strict sound
attenuation requirements. For quick selection of standard series
MAH attenuators, the following insertion losses (db) are listed in
the table :
Hz

63

125

250

500

1000

2000

4000

SAT1

5

11

11

15

22

29

22

8000
15

SAT2

10

20

21

28

42

56

42

27

Plenum Sections
Empty plenums can be supplied either for future use or for
particular applications like access, end vertical assembly, end
bottom plenum for bottom return air applications, etc. Standard
sizes are listed in the dimensional data.
Plenums are available in three different sizes of 18” (451mm)
[PEM1], 24” (610mm) [PEM2], and 36” (914mm) [PEM3] depth.
Custom sizes to suite a particular requirement can be supplied as
an option

Heat Recovery Section

Mixing Box Section
Mixing box [BMX] with fresh air and return air dampers are
available to mix the outside fresh air with recirculated return air.
Both the return and fresh air dampers are sized to handle 0-100%
of the total supply air. Combination of mixing box and panel filter
[BMXP] can be provided in one section, if required.

In order to conserve the energy consumption by exchanging
energy between the supply and exhaust air streams, various types
of heat recovery systems can be provided as an integral part of
SKM MAH units. These depend upon special installation and other
requirements like :
•

Run Around Coil System [RRC] : This system comprises
of two coils placed in the supply and exhaust air streams.
The coils are to be connected in a closed loop via piping and
circulating pump (supplied by others). Water or glycol is
circulated as a heat transfer medium.
This system offers efficiency up to 65% and recovers sensible
heat only.

•

Fixed Plate Heat Recovery System [RHP] : Fixed plate
heat recovery system consists of fixed aluminum plates
separating the exhaust and supply air streams. The exhaust
air passes through the exchanger from end to end and the
supply air stream passes through in a counter flow. The two
air streams are totally segregated and flow through individual
passages formed by the plates within the exchanger. The
plates separating the two air streams act as the heat transfer
medium. This system offers efficiency up to 70% and recovers
sensible heat only.

Exhaust Box Section
Exhaust box [BEX] with exhaust air dampers are available. When
used in combination with mixing box with motorized dampers, it
provides excellent economizer control.

Multi-zone & Dual-duct Sections
SKM MAH units can be designed to incorporate blow through
multi-zone section complete with cooling/heating (if required) coils
and mechanically interlocked dampers.
Vertical [MZNV] and horizontal [MZNH] discharge arrangements

MAH - Series
Page 7

SECTIONS & SUB ASSEMBLIES
UNITS FOR OUTDOOR INSTALLATION
•

Rotary Heat Recovery System (Thermal Wheel) [RHR]:
Heat Wheels are revolving cylinders consisting of an airpermeable matrix with large interior surface. The matrix is
cooled as cold air is passed through the wheel. This in turn
cools the fresh air stream when the cooled rotating matrix
comes in line with the supply air stream. When sprayed with
a hygroscopic coating, the heat wheel will transfer moisture
from the fresh air stream to the exhaust stream.
Heat Wheel offers are capable of recovering both sensible
and latent heats and offer efficiencies as high as 85%. Heat
wheels are ideal for applications that demand high percentage
of fresh air intake like in hospitals, research labs, schools and
pharmaceutical companies.

MAH Units for Outdoor Installation
For outdoor installations SKM provides various options to protect
the unit from varying climates. These include :
•

Weather proof top cover [ATC] to protect against rain. It is
made with slight pitch down from the centerline to ends on
both sides to avoid rain accumulation on the top cover of the
unit.

•

2” (50 mm) thick panels [2SG] / [2SF] / [2SB] to prevent
cold bridges.

•

Air Intake Louver [AIL] to prevent foreign material to enter
the unit in fresh air intake.

•

Sand trap louver [ASL] to extract coarse sand prior to the
entry in the unit.

•

Rain hood [ARH] to prevent rain entering the fresh air intake.

•

Bird screen [ABS] to prevent foreign material to enter the
unit in fresh air intake.

Accessories and Options
In order to meet most application requirements, MAH units can
be supplied with various accessories and options, such as:

•

Heat Pipe System [RPR] : Heat pipe is a simple heat transfer
devices consisting of two coils, pre-cooling and re-heating,
connected together without any moving part in between them
and containing phase change fluid. It is automatically activated
by the difference in temperature performing a double function.
First, pre-cooling the return air allows the cooling coil to work
cooler and condense more moisture. Second, re-heating
the supply air brings about a more comfortable temperature
and relative humidity. This entire function of humidity reduction
is performed while saving energy.

•

Stainless steel construction. [SSC]

•

Aluminum construction. [AAC]

•

Bulk Head Light Fittings. [BLF]

•

Stainless Steel Fasteners. [SSF]

•

Hinged Access doors with latches. [QDL]

•

Differential Air Pressure Switch. [APC]

•

Manometers [MAF] to monitor air pressure drop across filters
can be supplied for field installation. SKM provides the the
provision for fixing only. Inclined tube manometers are
supplied loose.

•

Walkway [WAW] can be provided in the desired section for
ease of maintenance. The length of the section would be
increased depending on the width of the walkway required.

•

Knockdown unit [SKD] can be provided for ease of
transportation or for difficult access areas.

•

Ceiling Suspended Units [CSU]

•

External Vibration Isolators [CAVM] can be supplied loose
for site installation

MAH - Series
Page 8

QUICK SELECTION
MOTOR DATA
Quick Selection

Motor Data
Rated Pow er Supply
(V / Ph / Hz)
380 / 3 / 50
415 / 3 / 50
440 / 3 / 50

380 / 3 / 60

220 / 3 / 60

460 / 3 / 60

1.
2.
3.

FLA
LRA
FLA
LRA
FLA
LRA
FLA
LRA
FLA
LRA

Am p

Am p

Am p

Am p

Am p

Motor Size, KW
0.55

0.75

1.1

1.5

2.2

3

4

5.5

7.5

11

15

18.5

22

30

1.7

2.0

2.6

3.7

5.2

7.1

9.2

7.0

9.0

11.6

17.1

25.6

35.1

49.4

12.0

15.2

21.1

29.1

36.0

43.0

58.0

72.0

117.0 163.0 216.0 255.0 308.0 369.0

1.5

1.8

2.3

3.2

4.7

6.5

8.0

10.6

13.9

6.0

8.2

11.2

16.0

25.0

33.5

43.0

65.0

104.0 135.0 197.0 227.8 275.4 330.7

1.6

1.9

2.6

3.4

4.9

6.7

8.4

11.7

15.0

21.6

6.0

7.5

10.3

15.3

22.8

31.3

44.0

65.0

99.0

136.0 189.0 227.8 275.4 330.7

26.0

37.4

18.5

26.4

28.4

34.0

41.0

53.0

3.4

4.5

5.9

8.3

11.5

14.7

20.3

13.0

17.8

26.5

39.5

54.2

78.2

112.5 171.5 238.0 327.0 465.0 561.0 672.0

1.6

1.7

2.3

3.4

4.5

6.2

7.8

10.2

13.5

7.0

8.7

12.0

18.0

26.3

36.5

51.0

75.0

114.0 156.0 218.0 255.0 308.0 369.0

35.0

75.0

58.0

2.8

24.9

62.0

43.0

10.4

18.4

49.2

36.0

40.9

100.0

54.2

Motors upto 3 KW are STAR connected for all power supplies, except for 220V/3Ph/60Hz which is DELTA connected.
The motors including and above 4 KW are DELTA connected and are suitable for STAR/DELTA starting.
Refer inside of the motor terminal box for actual connections.

MAH - Series
Page 9

NOMINAL CAPACITIES
Nominal Capacity Rating - Cooling Coils
Fin Spacing : 8 fpi ( 3.2 mm )

Model

Coil Area Rows

MAH

ft²

m²

12

15.00 24.00

2.5

0.23

16

15.00 31.00

3.2

0.30

24

21.00 32.50

4.7

0.44

32

24.00 38.50

6.4

0.60

40

24.00 48.00

8.0

0.74

50

30.00 48.00 10.0 0.93

62

36.00 50.00 12.5 1.16

80

36.00 64.00 16.0 1.49

100

45.00 64.00 20.0 1.86

120

45.00 76.80 24.0 2.23

150

48.00 90.00 30.0 2.79

200

60.00 96.00 40.0 3.72

250

60.00 120.00 50.0 4.65

320

72.00 128.00 64.0 5.95

400

90.00 128.00 80.0 7.43

450

90.00 144.00 90.0 8.36

4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8
4
6
8

Chilled Water Coils

Direct Expansion Coils

@ 80/67°F ( 26.7/19.4°C ) On-Coil DBT / WBT

@ 80/67°F ( 26.7/19.4°C )

& 45/55°F ( 7.2/12.8°C ) EWT/LWT

On-Coil DBT / WBT

Air Flow

Total

Sensible

Water Flow

Water

Total

Sensible

Rate

Capacity

Capacity

Rate

Pressure

Capacity

Capacity

cfm

l/s

1200

566

1600

755

2400 1133

3200 1510

4000 1888

5000 2359

6200 2926

8000 3775

10000 4719

12000 5663

15000 7078

20000 9438

25000 11797

32000 15101

40000 18876

45000 21235

MBh
22.7
34.1
44.2
41.1
56.6
61.4
61.7
85.0
92.5
85.5
109.6
127.1
96.4
141.9
163.9
120.5
177.4
204.9
151.8
222.3
256.1
251.0
314.1
358.6
313.8
392.6
448.2
340.3
482.9
549.8
441.9
592.9
636.9
596.1
797.4
858.3
775.7
971.5
1111.8
1004.1
1256.3
1434.2
1255.1
1570.4
1792.8
1255.3
1794.1
2047.9

KW
6.7
10.0
13.0
12.0
16.6
18.0
18.1
24.9
27.1
25.1
32.1
37.3
28.3
41.6
48.0
35.3
52.0
60.0
44.5
65.1
75.1
73.6
92.1
105.1
92.0
115.1
131.4
99.7
141.5
161.2
129.5
173.8
186.7
174.7
233.7
251.6
227.4
284.7
325.9
294.3
368.2
420.4
367.9
460.3
525.5
367.9
525.9
600.2

MBh
18.2
24.6
29.9
27.9
36.9
40.8
41.7
55.3
61.2
56.9
72.4
83.2
67.4
92.4
106.0
84.3
115.5
132.5
105.4
144.2
165.2
177.0
212.9
236.0
221.3
266.1
294.9
252.0
324.1
358.9
321.1
400.8
427.9
430.7
537.2
574.2
549.9
661.4
733.8
708.1
851.7
943.8
885.1
1064.6
1179.8
937.4
1208.6
1340.1

KW
5.3
7.2
8.8
8.2
10.8
11.9
12.2
16.2
17.9
16.7
21.2
24.4
19.8
27.1
31.1
24.7
33.8
38.8
30.9
42.3
48.4
51.9
62.4
69.2
64.9
78.0
86.4
73.9
95.0
105.2
94.1
117.5
125.4
126.2
157.4
168.3
161.2
193.9
215.1
207.5
249.6
276.6
259.4
312.0
345.8
274.8
354.2
392.8

MAH - Series
Page 10

gpm
4.5
6.8
8.8
8.2
11.3
12.3
12.3
17.0
18.5
17.1
21.9
25.4
19.3
28.4
32.8
24.1
35.5
41.0
30.4
44.5
51.2
50.2
62.8
71.7
62.8
78.5
89.6
68.1
96.6
110.0
88.4
118.6
127.4
119.2
159.5
171.7
155.1
194.3
222.4
200.8
251.3
286.8
251.0
314.1
358.6
251.1
358.8
409.6

l/s
0.3
0.4
0.6
0.5
0.7
0.8
0.8
1.1
1.2
1.1
1.4
1.6
1.2
1.8
2.1
1.5
2.2
2.6
1.9
2.8
3.2
3.2
4.0
4.5
4.0
5.0
5.7
4.3
6.1
6.9
5.6
7.5
8.0
7.5
10.1
10.8
9.8
12.3
14.0
12.7
15.9
18.1
15.8
19.8
22.6
15.8
22.6
25.8

ft.wg
0.4
1.1
2.1
7.1
16.4
4.2
8.3
19.0
4.9
12.6
9.5
7.3
3.3
16.8
12.9
3.3
16.8
12.9
3.7
18.5
14.2
17.3
12.4
9.3
17.3
12.4
9.3
3.9
20.1
15.0
6.1
13.7
3.3
7.3
16.2
3.9
13.3
9.5
7.2
15.9
11.4
8.5
15.9
11.4
8.5
3.1
15.6
11.7

KPa
1.3
3.3
6.2
21.3
49.0
12.4
24.7
56.8
14.5
37.7
28.2
21.9
9.8
50.1
38.5
9.8
50.1
38.5
10.9
55.3
42.3
51.9
37.1
27.9
51.9
37.1
27.9
11.7
59.9
44.9
18.2
40.9
9.9
21.7
48.5
11.8
39.8
28.5
21.5
47.5
34.0
25.5
47.5
34.0
25.5
9.1
46.5
34.9

MBh
35.6
43.2
46.7
46.7
56.9
61.7
69.3
84.7
91.9
93.1
113.6
123.1
116.2
141.8
153.7
145.3
177.3
192.2
180.8
220.5
238.9
232.4
283.6
307.5
290.5
354.6
384.4
348.6
425.5
461.2
435.8
531.8
576.5
581.0
709.1
768.7
726.3
886.4
960.9
929.6
1134.6
1229.9
1162.0
1418.2
1537.4
1307.3
1595.5
1729.6

KW
MBh
10.4
22.7
12.7
28.0
13.7
30.9
13.7
29.9
16.7
37.0
18.1
40.9
20.3
44.5
24.8
55.2
26.9
60.9
27.3
59.7
33.3
73.9
36.1
81.6
34.1
74.5
41.6
92.3
45.1 101.9
42.6
93.2
52.0 115.4
56.3 127.4
53.0 115.9
64.6 143.5
70.0 158.3
68.1 149.1
83.1 184.6
90.1 203.8
85.1 186.3
103.9 230.8
112.7 254.8
102.2 223.6
124.7 277.0
135.2 305.7
127.7 279.5
155.9 346.2
169.0 382.1
170.3 372.7
207.8 461.6
225.3 509.5
212.9 465.9
259.8 577.0
281.6 636.9
272.5 596.3
332.5 738.6
360.5 815.3
340.6 745.4
415.7 923.2
450.6 1019.1
383.2 838.6
467.6 1038.6
506.9 1146.4

KW
6.7
8.2
9.1
8.8
10.9
12.0
13.0
16.2
17.9
17.5
21.7
23.9
21.8
27.1
29.9
27.3
33.8
37.3
34.0
42.0
46.4
43.7
54.1
59.7
54.6
67.6
74.7
65.5
81.2
89.6
81.9
101.5
112.0
109.2
135.3
149.3
136.5
169.1
186.7
174.8
216.5
238.9
218.5
270.6
298.7
245.8
304.4
336.0

NOMINAL CAPACITIES
Nominal Capacity Rating - Heating Coils
H ot W ater C oils

Steam C oils

@ 70°F ( 21.1°C ) EA T

@ 70°F ( 21.1°C ) EA T & 2 psig

& 180/160°F ( 82.2/71.1°C ) EW T/LW T

( 0.14 bar ) steam pressure

Fin Spacing : 8 fpi ( 3.2 m m )

M odel

C oil A rea

MAH
12
16
24
32
40
50
62
80
100
120
150
200
250
320
400
450

ft²
15

24

15

31

21

32.5

24

38.5

24

48

30

48

36

50

36

64

45

64

45

76.8

48

90

60

96

60

120

72

128

90

128

90

144

R ows

m²

2.5

0.23

3.2

0.30

4.7

0.44

6.4

0.60

8.0

0.74

10.0

0.93

12.5

1.16

16.0

1.49

20.0

1.86

24.0

2.23

30.0

2.79

40.0

3.72

50.0

4.65

64.0

5.95

80.0

7.43

90.0

8.36

1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2

A ir Flow
R ate
cfm

l/s

1200

566

1600

755

2400 1133
3200 1510
4000 1888
5000 2359
6200 2926
8000 3775
#### 4719
#### 5663
#### 7078
#### 9438
#### ####
#### ####
#### ####
#### ####

C apacity
MBh
25.8
45.7
36.4
64.2
54.5
96.4
76.1
133.8
84.0
161.2
105.0
201.5
130.3
252.7
245.2
416.6
306.5
520.7
326.2
643.5
427.3
828.9
577.3
1041.4
756.6
1350.5
980.9
1750.0
1226.2
2082.9
1415.6
2386.7

KW
7.5
13.4
10.7
18.8
16.0
28.3
22.3
39.2
24.6
47.2
30.8
59.1
38.2
74.1
71.9
122.1
89.8
152.6
95.6
188.6
125.2
242.9
169.2
305.2
221.8
395.8
287.5
512.9
359.4
610.5
414.9
699.5

W ater Flow

W ater Pressure

R ate

D rop

gpm
2.6
4.6
3.6
6.4
5.4
9.6
7.6
13.4
8.4
16.1
10.5
20.1
13.0
25.3
24.5
41.7
30.7
52.1
32.6
64.4
42.7
82.9
57.7
104.1
75.7
135.1
98.1
175.0
122.6
208.3
141.6
238.7

l/s
0.2
0.3
0.2
0.4
0.3
0.6
0.5
0.8
0.5
1.0
0.7
1.3
0.8
1.6
1.5
2.6
1.9
3.3
2.1
4.1
2.7
5.2
3.6
6.6
4.8
8.5
6.2
11.0
7.7
13.1
8.9
15.1

ft.wg
1.8
1.4
3.6
2.9
4.2
3.3
6.4
5.0
1.7
3.0
1.7
3.0
1.7
3.3
9.4
6.9
9.4
6.9
2.2
10.9
3.5
16.6
4.1
6.6
7.5
11.8
8.8
14.0
8.8
6.5
12.1
8.8

K Pa
5.3
4.3
10.9
8.6
12.5
9.9
19.1
14.9
5.2
9.1
5.2
9.1
5.0
10.0
27.9
20.5
27.9
20.5
6.7
32.7
10.4
49.6
12.4
19.7
22.3
35.1
26.4
41.7
26.4
19.3
36.3
26.2

Capacity
MBh
56.0
101.0
72.4
130.5
106.2
191.5
143.8
259.4
179.2
323.2
224.0
404.0
280.0
505.0
354.1
638.7
450.9
813.3
536.0
966.8
672.0
1212.0
896.0
1616.0
1120.0
2020.0
1433.6
2585.6
1792.0
3232.0
2016.0
3636.0

KW
16.4
29.6
21.2
38.2
31.1
56.1
42.1
76.0
52.5
94.7
65.7
118.4
82.1
148.0
103.8
187.2
132.2
238.4
157.1
283.4
197.0
355.2
262.6
473.7
328.3
592.1
420.2
757.8
525.2
947.3
590.9
1065.7

For Capacities at different air conditions please refer to SKM
Computer Selection Software

Fin Spacing Correction Factor
Fin Spacing
FPI

mm

8
10
12

3.2
2.5
2.1

Correction Factor
1.00
1.06
1.13

MAH - Series
Page 11

AIR PRESSURE DROP
Air Pressure Drop
300
0.10

DDCT

A IR PR ESSU R E D R OP, in wg
C o il F ace Velo city, fp m
350
400
450
500
550
0.14 0.19 0.24 0.30 0.36

600
0.43

A IR PR ESSU R E D R OP, Pascals
C o il F ace Velo city, m /s
1.5 1.8 2.0 2.3 2.5 2.8 3.0
25
35
47
60
75
90 107

MZNH, M ZNV

0.14

0.19

0.24

0.28

0.34

0.40

0.47

35

47

60

70

85

100

117

F IH P D = 2.0 inw g ( 498 Pa )

0.87

1.03

1.20

1.37

1.55

NR

NR

217

257

299

341

386

NR

NR

F A T, F A D H , F R D H , F TZ A F

0.08

0.09

0.10

0.12

0.15

0.18

0.21

20

22

25

30

37

45

52

H SEG, H SIG

0.03

0.04

0.05

0.06

0.07

0.08

0.09

7

10

12

15

17

20

22

HFF

0.30

0.39

0.48

0.61

0.71

0.79

0.90

75

97

120

152

177

197

224

H PS

0.20

0.27

0.35

0.43

0.54

0.63

0.74

50

67

87

107

135

157

184

C EH F

0.03

0.04

0.05

0.06

0.07

0.08

0.09

7

10

12

15

17

20

22

For Models

MAH-80 to 450

For Models

MAH-12 to 62

CCW , CDX
p er ro w ( W ET )
C C W , C D X , C H W , C ST
p er ro w ( D R Y )
CCW, CDX,
p er ro w ( W ET )
C C W , C D X , C H W , C ST
p er ro w ( D R Y )

8 fpi

0.03

0.03

0.04

0.05

0.06

0.08

0.09

7

9

11

13

16

19

22

10 fpi

0.03

0.04

0.05

0.06

0.08

0.09

0.11

8

10

13

16

19

23

27

12 fpi

0.04

0.05

0.06

0.08

0.09

0.11

0.13

9

12

15

19

23

27

31

8 fpi

0.02

0.03

0.03

0.04

0.05

0.06

0.07

5

7

8

10

12

15

17

10 fpi

0.02

0.03

0.04

0.05

0.06

0.07

0.08

6

8

10

12

15

18

21

12 fpi

0.03

0.04

0.05

0.06

0.07

0.08

0.10

7

9

12

15

18

21

24

8 fpi

0.05

0.06

0.08

0.09

0.11

0.13

0.15

11

15

19

23

28

32

38

10 fpi

0.06

0.07

0.09

0.11

0.13

0.16

0.18

14

18

23

28

33

39

45

12 fpi

0.06

0.08

0.11

0.13

0.16

0.18

0.21

16

21

26

32

39

46

53

8 fpi

0.04

0.05

0.06

0.07

0.08

0.10

0.12

9

11

14

18

21

25

29

10 fpi

0.04

0.06

0.07

0.09

0.10

0.12

0.14

11

14

17

21

25

30

35

12 fpi

0.05

0.07

0.08

0.10

0.12

0.14

0.16

12

16

20

25

30

35

41

Elim in ato r

0.02

0.04

0.06

0.08

0.10

0.11

0.12

5

10

15

20

25

27

30

DFC, DFDB

0.01

0.01

0.02

0.02

0.02

0.02

0.02

3

3

4

4

5

5

6

F IPI F PD = 0.5 inw g ( 125 Pa

AF

0.05

0.07

0.10

0.12

0.18

0.22

0.26

12

17

25

30

45

55

65

)

SF

0.15

0.17

0.20

0.23

0.27

0.31

0.35

37

42

50

57

67

77

87

F IPV D = 0.5 inw g ( 125 Pa )

F IPI x 0.7

F IPI x 0.7

F IB G1D = 1.0 inw g ( 249 Pa )

0.22

0.30

0.38

0.49

0.60

0.73

0.86

55

75

95

122

149

182

214

F IB G2D = 1.0 inw g ( 249 Pa )

0.20

0.27

0.35

0.45

0.55

0.67

0.79

50

67

87

112

137

167

197

F IB G3D = 1.0 inw g ( 249 Pa )

0.18

0.25

0.32

0.41

0.50

0.61

0.72

45

62

80

102

125

152

179

F IR L

0.06

0.09

0.12

0.15

0.18

0.22

0.26

15

22

30

37

45

55

65

B EX , B M X

0.06

0.08

0.10

0.11

0.13

0.14

0.16

15

20

25

27

32

35

40

A SL

0.18

0.25

0.32

0.41

0.50

0.61

0.72

45

62

80

102

125

152

179

A IL

0.03

0.04

0.05

0.06

0.07

0.08

0.1

7

10

12

15

17

20

25

SA T1

0.04

0.05

0.06

0.08

0.09

0.11

0.14

10

12

15

20

22

27

35

SA T2

0.05

0.06

0.07

0.09

0.11

0.13

0.16

12

15

17

22

27

32

40

PEM 1

0.03

0.05

0.06

0.07

0.08

0.09

0.10

7

12

15

17

20

22

25

PEM 2

0.04

0.07

0.08

0.09

0.11

0.12

0.13

10

17

20

23

27

30

33

PEM 3

0.06

0.10

0.12

0.14

0.16

0.18

0.20

15

25

30

35

40

45

50

For sections not mentioned, please consult SKM

MAH - Series
Page 12

FAN PERFORMANCE

Type
FAT
FADH
FAT
FADH
FAT
FADH
FAT
FADH
FRDH
FAT
FADH
FRDH
FAT
FADH
FRDH
FTZAF
FAT
FADH
FRDH
FTZAF
FAT
FADH
FRDH
TZF
FADH
FRDH
FTZAF
FADH
FRDH
FTZAF
ADH
FADH
FTZAF
FADH
FRDH
FTZAF
FADH
FRDH
FTZAF
FADH
FRDH
FTZAF
FADH
FRDH
FTZAF
FADH
FRDH
FTZAF

12
16
24
32
40

50

62

80

100
120
150
200
250
320
400
450

Fl
ow

Fa
n

MAH

Ai
r

Mo
de
l

Fan Performance

cfm

l/s

1200

566

1600

755

2400

1133

3200

1510

4000

1888

5000

2359

6200

2926

8000

3775

10000 4719

12000 5663

15000 7078

20000 9438

25000 11797

32000 15101

40000 18876

45000 21235

Total Static Pressure, inwg (Pa)
0.5 (125) 1.0 (250) 1.5 (375) 2.0 (500) 2.5 (625) 3.0 (750) 3.5 (875) 4.0 (1000) 5.0 (1250)
rpm
822
808
704
748
831
859
634
600
1669
503
658
2001
546
472
1301
1183
438
517
1548
1404
491
491
1398
1283
461
1258
1202
397
1064
1035
332
925
885
313
863
823
268
755
736
240
678
664
212
616
605
226
682
671

kW
0.12
0.16
0.19
0.21
0.43
0.47
0.53
0.48
0.56
0.54
0.78
0.96
0.87
0.72
0.85
0.65
0.81
1.15
1.41
1.03
1.37
1.60
1.93
1.46
1.99
2.35
2.00
2.15
2.51
2.18
2.59
3.01
2.47
3.78
4.49
3.48
4.63
5.47
4.46
5.94
7.16
5.95
7.31
9.10
7.61
9.66
12.36
10.08

rpm
1126
1144
953
1032
1012
1071
819
794
1853
671
819
2152
690
627
1442
577
644
1668
602
598
1499
559
1347
488
1150
1113
415
999
962
386
925
886
334
811
795
297
728
713
263
660
647
272
722
709

kW
0.23
0.29
0.33
0.36
0.60
0.65
0.77
0.74
0.76
0.86
1.07
1.19
1.22
1.12
1.14
1.27
1.58
1.77
1.93
2.13
2.40
2.63
2.92
2.93
3.20
2.88
3.59
3.83
3.35
5.10
5.57
4.50
6.30
6.84
5.82
7.94
8.86
7.74
9.91
11.13
9.86
12.51
14.60
12.67

rpm
1384
1419
1177
1275
1184
1270
992
972
2021
821
974
2298
823
772
1569
703
769
1780
710
704
1592
654
1431
575
1229
497
1067
1034
453
983
945
395
863
849
352
775
758
312
703
686
317
761
744

kW
0.35
0.44
0.49
0.55
0.80
0.86
1.02
1.05
0.97
1.24
1.40
1.43
1.63
1.59
1.46
1.79
2.08
2.14
2.53
2.77
2.87
3.37
3.50
3.83
3.89
4.77
4.66
4.21
6.59
6.67
5.58
8.14
8.24
7.21
10.32
10.62
9.50
12.81
13.28
12.04
15.59
16.95
15.13

rpm
1606
1648
1377
1487
1349
1458
1148
1133
2174
957
1120
2436
947
905
1688
1591
815
888
1885
812
808
1680
745
1509
659
1303
574
1132
517
1037
1001
451
913
899
405
821
800
359
744
722
360
799
778

kW
0.48
0.59
0.67
0.75
1.01
1.09
1.28
1.40
1.19
1.65
1.77
1.69
2.08
2.12
1.79
1.55
2.34
2.65
2.52
3.17
3.51
3.36
4.20
4.10
4.86
4.60
6.11
5.53
8.26
7.80
6.71
10.13
9.68
8.62
13.04
12.44
11.27
16.03
15.53
14.23
18.94
19.40
17.57

rpm
1802
1845
1557
1675
1507
1633
1291
1279
2316
1080
1257
2566
1062
1026
1798
1714
917
1001
1984
1854
908
909
1765
1654
832
1585
1515
739
1374
1328
646
1194
577
1090
1055
503
961
947
454
864
841
403
784
758
401
835
810

kW
0.61
0.75
0.84
0.96
1.24
1.35
1.57
1.76
1.41
2.09
2.18
1.96
2.57
2.70
2.13
1.89
2.93
3.27
2.92
2.48
3.85
4.34
3.85
3.23
5.11
4.70
4.25
6.00
5.34
4.91
7.56
6.42
10.08
8.96
7.89
12.28
11.15
10.08
16.03
14.32
13.10
19.55
17.85
16.47
22.57
21.93
20.03

rpm
1978
2019
1721
1844
1657
1797
1422
1412
2449
1194
1386
2688
1170
1137
1903
1830
1009
1107
2079
1957
997
1006
1847
1743
913
1658
1588
814
1441
1396
714
1255
1228
634
1141
1108
552
1008
994
500
906
881
445
822
792
441
870
84.2

kW
0.75
0.91
1.01
1.19
1.48
1.61
1.87
2.15
1.63
2.54
2.61
2.23
3.09
3.31
2.48
2.25
3.54
3.93
3.33
2.87
4.55
5.26
4.36
3.73
6.10
5.32
4.94
7.24
6.09
5.63
9.11
7.35
6.93
12.03
10.16
9.11
14.55
12.66
11.57
19.23
16.26
14.96
23.36
20.26
18.75
26.48
24.53
22.53

rpm
2178
1872
1999
1800
1951
1535
2575
1506
2805
1239
2002
1942
1094
1207
2169
2058
1080
1098
1925
1829
991
1728
1661
884
1506
1461
777
1314
1289
687
1190
1158
598
1053
1039
543
947
919
484
858
826
479
905
873

kW
1.07
1.19
1.42
1.73
1.90
2.55
1.86
3.05
2.50
3.95
2.85
2.62
4.19
4.63
3.75
3.29
5.28
6.25
4.89
4.25
7.14
5.95
5.46
8.57
6.86
6.37
10.74
8.32
7.90
14.10
11.40
10.37
16.96
14.21
13.11
22.62
18.26
16.89
27.44
22.74
21.10
30.65
27.21
25.08

Performance shown at nominal airflow rates. For other airflow rates refer to SKM computer selection.

MAH - Series
Page 13

rpm
2323
2143
1936
2095
1648
2695
1620
2916
1335
2098
2048
1301
2257
2155
1186
2002
1914
1064
1797
1732
951
1568
1526
836
1372
1347
1238
1208
1098
1083
986
957
522
894
859
938
904

kW
1.24
1.67
1.99
2.19
2.96
2.10
3.52
2.78
4.63
3.22
3.01
5.36
4.18
3.71
7.29
5.42
4.80
8.24
6.60
6.10
9.98
7.66
7.14
12.46
9.31
8.89
12.67
11.67
15.81
14.70
20.30
18.87
31.78
25.28
23.52
29.95
27.68

rpm
2360
1856
2922
1828
3126
1509
2278
2249
2422
2340
2149
2076
1929
1870
1074
1688
1988
1483
1459
1304
1183
1168
1061
1031
962
924
963

kW
2.81
3.82
2.59
4.49
3.35
6.05
3.99
3.82
5.06
4.60
6.53
5.93
7.94
7.45
13.01
9.30
9.29
11.41
10.95
14.47
19.12
18.02
24.54
22.99
30.55
28.54
33.05

DIMENSIONAL DATA
Dimensional Data

CEHF
CHW

HSIG
L

15
(381)

J

6
(152)

32
(813)

12

38
965

24
32

46
1168
52
1321

40
50

64
1626

62
80
100
120
150
200
250
320
400
450

h

33
838
36
914
42
1067
48
1219

EH

L

56
1422

16
406

3.94
100

L1

L2

48
1219

14
356

28
711

18
457

L

32
813
36
914

60
1524

34
864

21
533

66
1676

40
1016

24
610

74
1880

45
1143

18
457

78
1981
92
2337
104
2642
112
2845
136
3454
144
3658
160
4064

57
1448
60
1524
72
1829
84
2134
102
2591

32
813
CHANNEL BASE FRAME

16

H

3.94
100

36
914
24
610

42
1067

58
1473

106
2692

70
1778

46
1168

118
2997

82
2083

54
1372

140
3556

102
2591

40
1016

4.92
125

52
1321

90
2286

6
(152)

J

FAT
FADH/FRDH/FTZAF
N
J
K
N
J
K
13.13 10.31 11.73 13.33 11.34 11.34
334
262
298
339
288
288
19
19
483 11.38 13.03 483 12.68 12.68
289
331
322
322
21
21
533 13.43 15.55 533
341
395
15.91 15.91
404
404
24
22.73 15.91 18.54 610
577
404
471
22 19.96 19.96
559
507
507
21
533 18.82 21.93
478
557
28
27.8 22.40 22.40
711
706
569
569
26.44 25.12 25.12
671
638
638
31.9 28.15 28.15
811
715
715
36.23 31.54 31.54
920
801
801
38.32 35.35 35.35
973
898
898
48.17 39.65 39.65
1224 1007 1007
49.75 44.49 44.49
1264 1130 1130
47
1194 49.88 49.88
1267 1267
55
1397

ALL DIMENSIONS ARE IN INCHES (MM).
FOR SECTIONS NOT MENTIONED CONSULT SKM.
FOR BASE FRAME DETAILS REFER PAGE 16.
FOR HEATING & COOLING COIL SECTIONS DETAILS REFER PAGE 16 & 17.

MAH - Series
Page 14

HPS

FAN POSITION 6

FIHP
W

SHEET METAL BASE FRAME

SIZE

15
(381)

L

L

L2

15
(381)

6
(152)

HFF

W

15
(381)

CST

FAN POSITION 3

HSEG
J

FAN POSITION 4

L

J

L

FAN POSITION 5

H

6
(152)

h

L1

J

FAN POSITION 1

7
(178)

EH

FAN PLAN VIEW

L1

J

FAN POSITION 2

EH
H

MZNH
MZNV

AIRFLOW
DIRECTION

7
(178)

L

10
(254)

L

K

DDCT

h

H

W

7
(178)

HUMIDIFIER HEATING
SECTIONS SECTIONS

FAN SECTION ARRANGEMENTS
6
(152)

BLOW THROUGH SECTIONS

N

COMMON SIDE VIEW

32
(813)

15
(381)

DIMENSIONAL DATA
Dimensional Data
COOLING SECTIONS

DAMPER AND
BY PASS SECTIONS

FILTER
SECTIONS

EXHAUST AND
MIXING BOX

LOUVERS

SOUND
ATENUATOR

HEAT RECOVERY
SECTIONS

PLENUMS

12
(305)

PEM1

ASL

SAT1
32
(813)

18
(457)

H
56
(1422)

H
L

24
(610)

36
(914)

RHR

3
(76)

PEM3

B
7
(178)

PEM2

SAT2

AIL

7
(178)

FIPBG1

30
(762)

A
L

L

BMX PLAN VIEW

L

FIBGI

L1

7
(178)

FIPV

BMX, BMXP

A

H

DFBP

CCWE, CDXE

5
(127)

L

RHP

7
(178)
EH

L

7
(178)

BEX

FIPI

DFC

CCW, CDX

A

34
(864)

4R/6R
L
L1

8R
L

L1

EH

L

L

20
508
8
203

22
559

28
711

22 28
559 711

14
356

L

A

18
457

12.5
318

40
1016
24
610

18.5
470

30
762

24.5
622

36
914

30.5
775

56
1422

34
864
28
711
20
508

68
1727

B

20
508
24
610
26
660
32
813
40
1016
50
1270

52
1321
22
559

30
(762)

42
1067

36.5
927

60
1524
62
1575
74
1880
90
2286
96
2438
120
3048
128
3251

26
660

*

80
2032

48
1219

42.5
1080

134
3404

FOR FIBG2 & FIPBG2 ADD 6 (152) TO FIBG1 & FIPBG1 RESPECTIVELY.
FOR FIBG3 & FIPBG3 ADD 14 (356)TO FIBG1 & FIPBG1 RESPECTIVELY.

MAH - Series
Page 15

L

42
1067
50
1270

SIZE
12
16
24
32
40

64
1626

50
62
80
100

76
1930

120
150

94
2388
124
3150
148
3759

200
250
320
400
450

PLAN VIEW

COIL CONNECTION SIZES
BASE FRAME DETAILS
Base Frame Details
SHEET METAL BASE FRAME

MODELS:
12 TO 100

CHANNEL BASE FRAME

h

MODELS:
120 TO 450

h

FOR SIZES 12 TO 100 UNITS WOULD BE SHIPPED UPTO MAXIMUM FRAME LENGTHS OF 124 INCHES (3150 mm), ABOVE THIS,
UNITS WOULD BE SHIPPED IN KNOCKDOWN SECTIONS.
FOR CEILING SUSPENDED UNITS (MODELS 12-100) ADDITIONAL STRUCTRAL STEEL CHANNEL FRAME WOULD BE PROVIDED.
WHEREVER NECESSARY SKM WOULD PROVIDE STEEL STRUCTURE CHANNEL FRAME FOR MODELS 12 TO 100.

Coil Connection Sizes
CCW
M o de l

4 R ows
12
16
24
32
40
50
62
80
10 0
12 0
15 0
200
250
320
400
450

inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm

CD X

In & O u t

D r ai n

6 R ows

L i qu i d

I n /O u t

In
1 R ow 2 R ows

8 R ows

4 R ows

6 R ows

8 R ows

4 R ows

6 R ows

8 R ows

1, 2 R ows

1 1/4
1 1/8
1 1/8
1 1/8
32
29
29
29
1 1/4
1 1/8
1 3/8
1 3/8
32
29
35
35
1 1/4
1 3/8
1 3/8
1 3/8
32
35
35
35
1 1/4
1 3/8
1 5/8
1 5/8
32
35
41
41
1 1/2
1 3/8
1 5/8
2 1/8
38
35
41
54
1 1/2
1 5/8
2 1/8
2 1/8
38
41
54
54
1 1/2
2 1/8
2 1/8
2 1/8
38
54
54
54
1 1/2
2 1/8
2 1/8
2 1/8
38
54
54
54
1 1/2
2 1/8
2 5/8
2 5/8
38
54
67
67
1 1/2
2 1/8
2 5/8
2 5/8
38
54
67
67
1 1/2
2 5/8
2 5/8
2 5/8
38
67
67
67
1 1/2
2 5/8
3 1/8
3 1/8
38
67
79
79
1 1/2 x 2
3 1/8
3 1/8
2 5/8 x 2
38 x 2
79
79
67 x 2
1 1/2 x 2 2 5/8 x 2 2 5/8 x 2 3 1/8 x 2
38 x 2
67 x 2
67 x 2
79 x 2
1 1/2 x 2 2 5/8 x 2 3 1/8 x 2 3 1/8 x 2
38 x 2
67 x 2
67 x 2
79 x 2
1 1/2 x 2 3 1/8 x 2 3 1/8 x 2 3 1/8 x 2
38 x 2
67 x 2
67 x 2
79 x 2

3/8
10
1/2
13
1/2
13
1/2
13
5/8
16
5/8
16
5/8
16
7/8
22
7/8
22
7/8
22
7/8
22
1 1/8
29
1 1/8
29
1 1/8
29
1 1/8 x 2
29 x 2
1 1/8 x 2
29 x 2

3/8
10
1/2
13
1/2
13
5/8
16
5/8
16
5/8
16
7/8
22
7/8
22
7/8
22
7/8
22
1 1/8
29
1 1/8
29
1 1/8
29
1 1/8 x 2
29 x 2
1 1/8 x 2
29 x 2
1 1/8 x 2
29 x 2

1/2
13
1/2
13
1/2
13
5/8
16
5/8
16
5/8
16
7/8
22
7/8
22
7/8
22
1 1/8
29
1 1/8
29
1 1/8
29
1 1/8 x 2
29 x 2
1 1/8 x 2
29 x 2
1 1/8 x 2
29 x 2
1 1/8 x 2
29 x 2

7/8
7/8
22
22
7/8
1 1/8
22
29
1 1/8
1 1/8
29
29
1 1/8
1 3/8
29
35
1 3/8
1 3/8
35
35
1 3/8
1 3/8
35
35
1 5/8
1 5/8
41
41
1 5/8
2 1/8
41
54
2 1/8
2 1/8
54
54
2 1/8
2 1/8
54
54
2 1/8
2 5/8
54
67
2 5/8
2 5/8
67
67
2 5/8
2 5/8
67
67
2 5/8
2 5/8 x 2
67
67 x 2
2 5/8 x 2 2 5/8 x 2
67 x 2
67 x 2
2 5/8 x 2 2 5/8 x 2
67 x 2
67 x 2

7/8
22
1 1/8
29
1 1/8
29
1 3/8
35
1 3/8
35
1 5/8
41
1 5/8
41
2 1/8
54
2 1/8
54
2 1/8
54
2 5/8
67
2 5/8
67
2 1/8 x 2
54 x 2
2 5/8 x 2
67 x 2
2 5/8 x 2
67 x 2
2 5/8 x 2
67 x 2

7/8
22
7/8
22
7/8
22
1 1/8
29
1 1/8
29
1 1/8
29
1 3/8
35
1 3/8
35
1 5/8
41
1 5/8
41
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8 x 2
54 x 2
2 1/8 x 2
54 x 2

MAH - Series
Page 16

CS T

CH W
S u ct i o n

1 5/8
41
1 5/8
41
1 5/8
41
1 5/8
41
1 5/8
41
1 5/8
41
2 1/8
54
2 1/8
54
2 5/8
67
2 5/8
67
2 5/8
67
2 5/8
67
2 5/8
67
2 5/8
67
2 5/8
67
2 5/8
67

Out

2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 5/8
67
2 5/8
67
2 5/8
67
2 5/8
67
3 1/8
79
3 1/8
79
3 1/8
79
3 1/8
79
3 1/8
79
3 1/8
79

1 R ow 2 R ows
1 3/8
35
1 3/8
35
1 3/8
35
1 3/8
35
1 3/8
35
1 3/8
35
1 5/8
41
1 5/8
41
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54

2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54
2 1/8
54

COIL CONNECTION LOCATIONS
Coil Connection Locations
CHW, CCW
D4

62
80
100
120
150
200
250
320
400
450

A5

A1

A1

CDXE

D4

D4
D3

D3

LIQUID
2x Ø

LIQUID
2x Ø

SUCTION
2x Ø

SUCTION
2x Ø

2 Rows
D3 D4
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.1 8.3
130 212
5.7 8.9
145 227
5.7 8.9
145 227
5.7 8.9
145 227
5.7 8.9
145 227
5.7 8.9
145 227

D2

D1
7.2
184
7.2
184
7.2
184
7.2
184
7.2
184
7.2
184
7.2
184
8.7
222
8.7
222
8.7
222
8.7
222
9.3
237
9.3
237
9.3
237
9.3
237
9.3
237

4 Rows
D2 D3
10.2 5.9
260 151
10.2 5.9
260 151
10.2 5.9
260 151
10.2 5.9
260 151
10.2 5.9
260 151
10.2 5.9
260 151
10.2 5.9
260 151
11.7 6.8
298 172
11.7 6.8
298 172
11.7 6.8
298 172
11.7 6.8
298 172
12.3 7.4
313 187
12.3 7.4
313 187
12.3 7.4
313 187
12.3 7.4
313 187
12.3 7.4
313 187

A7
A1

D1

NO. OF ROWS
6 Rows
D4 D1 D2 D3
8.5 7.2 10.2 5.1
217 184 260 129
8.5 7.2 10.2 5.1
217 184 260 129
8.5 7.2 10.2 5.1
217 184 260 129
8.5 7.2 10.2 5.1
217 184 260 129
8.5 7.2 10.2 5.1
217 184 260 129
8.5 7.2 10.2 5.1
217 184 260 129
8.5 7.2 10.2 5.1
217 184 260 129
10.7 8.7 11.7 5.5
271 222 298 139
10.7 8.7 11.7 5.5
271 222 298 139
10.7 8.7 11.7 5.5
271 222 298 139
10.7 8.7 11.7 5.5
271 222 298 139
11.3 9.3 12.3 6.1
286 237 313 154
11.3 9.3 12.3 6.1
286 237 313 154
11.3 9.3 12.3 6.1
286 237 313 154
11.3 9.3 12.3 6.1
286 237 313 154
11.3 9.3 12.3 6.1
286 237 313 154

D2

SINGLE
D4
9.4
239
9.4
239
9.4
239
9.4
239
9.4
239
9.4
239
9.4
239
12.0
304
12.0
304
12.0
304
12.0
304
12.6
319
12.6
319
12.6
319
12.6
319
12.6
319

D1
8.7
222
8.7
222
8.7
222
8.7
222
8.7
222
8.7
222
8.7
222
10.2
260
10.2
260
10.2
260
10.2
260
10.8
275
10.8
275
10.8
275
10.8
275
10.8
275

8 Rows
D2 D3
11.7 5.7
298 145
11.7 5.7
298 145
11.7 5.7
298 145
11.7 5.7
298 145
11.7 5.7
298 145
11.7 5.7
298 145
11.7 5.7
298 145
13.2 5.7
336 144
13.2 5.7
336 144
13.2 5.7
336 144
13.2 5.7
336 144
13.8 6.3
351 159
13.8 6.3
351 159
13.8 6.3
351 159
13.8 6.3
351 159
13.8 6.3
351 159

MAH - Series
Page 17

D4
11.8
299
11.8
299
11.8
299
11.8
299
11.8
299
11.8
299
11.8
299
14.8
375
14.8
375
14.8
375
14.8
375
15.4
390
15.4
390
15.4
390
15.4
390
15.4
390

A6

A5

A7
A6

A5

DRAIN Ø

A1

A2

DRAIN Ø

A1

DRAIN Ø

A3

A4

IN 2x Ø

A3

A2

DRAIN Ø

A4

OUT 2x Ø

IN 2x Ø

inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm

D2

CDX

D3

OUT 2x Ø

1,
D1
6.7
171
6.7
171
6.7
171
6.7
171
6.7
171
6.7
171
6.7
171
6.7
171
6.7
171
6.7
171
6.7
171
7.3
186
7.3
186
7.3
186
7.3
186
7.3
186

DRAIN Ø

D1

D4

A1

DOUBLE CIRCUITING

50

SUCTION Ø

D2

D3

SIZE

40

SUCTION Ø
DRAIN Ø

CCWE

D1

32

LIQUID Ø

A1

D1

D4

24

D3

LIQUID Ø

DRAIN Ø

DRAIN Ø
A1

DRAIN Ø

CHW, CCW

16

IN Ø

D4
D3

A2

IN Ø

D1

12

D4

OUT Ø
A2

OUT Ø

CDXE

D3

OUT Ø
A2

IN Ø

CDX

D4
D3

D1

A1

SINGLE CIRCUITING

D4

CCWE

A5

CST

A1
14.2
360
14.2
360
14.2
360
14.2
360
14.2
360
14.2
360
14.2
360
14.7
373
14.7
373
14.7
374
14.7
374
15.1
385
16.1
410
16.1
410
16.1
410
16.1
410

CIRCUIT
A2 A5
19.2 18.2
487 461
19.2 18.2
487 461
25.2 21.8
639 553
28.2 23.6
715 599
28.2 23.6
715 599
34.2 27.2
868 690
40.2 30.8
1020 781
40.7 31.3
1033 794
49.7 36.7
1262 932
49.7 36.7
1263 932
52.7 38.5
1339 978
65.1 46.1
1655 1172
66.1 47.1
1680 1197
78.1 54.3
1985 1380
96.1 65.1
2442 1655
96.1 65.1
2442 1655

DOUBLE
A2
14.2
360
14.2
360
14.7
373
16.2
411
16.2
411
19.2
487
22.2
563
22.7
576
27.2
690
27.2
691
28.7
729
35.1
893
36.1
918
42.1
1070
51.1
1299
51.1
1299

A3
21.7
550
21.7
550
24.7
627
26.2
665
26.2
665
29.2
741
32.2
817
32.7
830
37.2
944
37.2
945
38.7
983
45.1
1147
46.1
1172
52.1
1324
61.1
1553
61.1
1553

CIRCUIT
A4 A5
21.7 13.7
550 349
21.7 13.7
550 349
25.2 15.5
639 395
28.2 16.4
715 418
28.2 16.4
715 418
34.2 18.2
868 463
40.2 20.0
1020 509
40.7 20.6
1033 522
49.7 23.3
1262 591
49.7 23.3
1263 592
52.7 24.2
1339 614
65.1 28.2
1655 717
66.1 29.2
1680 742
78.1 32.8
1985 834
96.1 38.2
2442 971
96.1 38.2
2442 971

A6
21.7
550
21.7
550
24.7
627
26.2
665
26.2
665
29.2
741
32.2
817
32.7
830
37.2
944
37.2
945
38.7
983
45.1
1147
46.1
1172
52.1
1324
61.1
1553
61.1
1553

A7
21.2
540
21.2
540
26.0
662
28.4
723
28.4
723
33.2
844
38.0
966
38.6
979
45.8
1162
45.8
1163
48.2
1224
58.2
1479
59.2
1504
68.8
1748
83.2
2114
83.2
2114

WEIGHTS
Weights
MAH
lbs
DDCT
kg
lbs
MZNH & MZNV
kg
lbs
FIHP
kg
lbs
FAT
kg
lbs
FADH
kg
lbs
FRDH
kg
lbs
FTZAF
kg
lbs
HSEG
kg
lbs
DRY
kg
HSIG
lbs
WET
kg
lbs
DRY
kg
HFF
lbs
WET
kg
lbs
DRY
kg
HPS
lbs
WET
kg
lbs
CEHF
kg
lbs
15"
Coil Fram e
(381mm) kg
(CCW,
lbs
22"
CDX , CHW,
(559mm) kg
lbs
28"
CST)
(711mm) kg
Alum inum
lbs
8 fpi
Coil block
(3.2mm) kg
lbs
10 fpi
per row
(2.5mm) kg
(CCW,
lbs
12 fpi
CDX , CHW,
(2.1mm) kg
CST)
Copper
lbs
8 fpi
Coil block
(3.2mm) kg
lbs
10 fpi
per row
(2.5mm) kg
(CCW,
lbs
12 fpi
CDX , CHW,
(2.1mm) kg
CST)
lbs
Water / row (CCW,CHW
kg

12
104
47
241
110
228
104
168
76
175
80
82
37
116
53
202
92
350
159
411
187
189
86
379
172
87
39
82
37
102
47
120
54
8.8
4.0
9.1
4.1
9.3
4.2
11.1
5.0
11.8
5.4
12.6
5.7
1.4
0.6

16
116
53
267
121
258
117
188
85
197
90
91
41
131
59
235
107
391
178
464
211
210
96
440
200
97
44
91
41
113
51
132
60
9.9
4.5
10.2
4.6
10.5
4.8
12.8
5.8
13.8
6.3
14.8
6.7
1.8
0.8

24
127
58
329
149
289
132
202
92
211
96
98
44
140
64
243
111
400
182
474
215
220
100
450
205
107
48
98
44
121
55
141
64
13.6
6.2
14.0
6.4
14.5
6.6
17.8
8.1
19.3
8.8
20.8
9.5
2.6
1.2

32
144
66
390
177
337
153
250
113
263
120
274
124
109
49
156
71
273
124
437
199
520
237
242
110
502
228
121
55
109
49
134
61
156
71
16.6
7.6
17.2
7.8
17.9
8.1
22.3
10.1
24.3
11.1
26.4
12.0
3.5
1.6

40
165
75
441
200
390
177
291
132
290
132
300
136
122
55
179
81
323
147
498
226
600
273
274
125
594
270
135
61
122
55
150
68
174
79
18.6
8.5
19.4
8.8
20.2
9.2
25.7
11.7
28.3
12.9
30.8
14.0
4.3
1.9

50
177
81
512
233
429
195
332
151
371
169
391
178
394
179
128
58
188
86
333
151
507
231
610
277
284
129
604
274
146
67
128
58
158
72
183
83
22.8
10.4
23.8
10.8
24.7
11.2
31.7
14.4
34.8
15.8
38.0
17.3
5.3
2.4

62
191
87
608
276
497
226
409
186
413
188
433
197
436
198
136
62
199
90
343
156
520
236
622
283
296
135
616
280
158
72
136
62
167
76
194
88
27.5
12.5
28.7
13.1
29.9
13.6
38.6
17.5
42.6
19.4
46.6
21.2
6.6
3.0

80
279
127
780
355
615
280
499
227
528
240
564
256
554
252
163
74
238
108
414
188
617
280
742
337
360
164
750
341
190
86
163
74
204
93
238
108
53.3
24.2
56.2
25.6
59.1
26.9
80.1
36.4
89.7
40.8
99.3
45.2
15.7
7.1

lbs

5

6

9

13

16

20

25

32

40

48

60

80

kg

2

3

4

6

7

9

11

15

18

22

27

36

Fin Spacing

Fin Spacing

Length

MODEL

Elim inator

MAH - Series
Page 18

100
120
150
200
250
306
359
400
491
573
139
163
182
223
261
1002 1291 1458 1889 2273
455
587
663
858 1033
686
810
916 1131 1336
312
368
417
514
607
664
896 1039 1345 1865
302
407
472
611
848
687
926 1085 1449 1961
312
421
493
659
892
662
939 1116 1520 2071
301
427
507
691
941
173
201
218
270
308
79
91
99
123
140
255
291
329
398
459
116
132
150
181
208
431
499
563
650
765
196
227
256
296
348
634
730
798
896 1040
288
332
363
407
473
758
877
965 1075 1258
345
399
439
489
572
376
439
479
557
644
171
200
218
253
293
766
899
999 1117 1324
348
409
454
508
602
209
243
272
342
398
95
110
124
155
181
173
201
218
270
308
79
91
99
123
140
217
253
275
334
382
99
115
125
152
174
254
297
323
388
446
115
135
147
177
203
65.6 75.0 90.0 116.8 139.9
29.8 34.1 40.9 53.1 63.6
69.2 79.4 95.5 124.1 149.1
31.5 36.1 43.4 56.4 67.8
72.9 83.8 101.0 131.4 158.2
33.1 38.1 45.9 59.7 71.9
99.1 115.2 140.3 183.9 223.7
45.0 52.4 63.8 83.6 101.7
111.1 129.7 158.3 207.9 253.8
50.5 58.9 72.0 94.5 115.4
123.1 144.1 176.4 232.0 283.8
56.0 65.5 80.2 105.4 129.0
19.6 23.2 28.7 38.2 47.2
8.9
10.5 13.1 17.4 21.5

320
649
295
2678
1217
1550
704
2235
1016
2393
1088
2634
1197
335
152
508
231
833
379
1108
503
1338
608
692
315
1412
642
448
203
335
152
415
188
483
219
175.5
79.8
187.2
85.1
198.9
90.4
282.7
128.5
321.2
146.0
359.7
163.5
60.3
27.4

400
727
330
3257
1481
1778
808
2742
1246
2964
1347
3196
1453
359
163
544
247
869
395
1144
520
1374
625
728
331
1448
658
494
225
359
163
444
202
516
235
217.3
98.8
231.9
105.4
246.5
112.0
351.3
159.7
399.4
181.5
447.5
203.4
75.4
34.3

450
783
356
3460
1573
1934
879
2873
1306
3096
1407
3327
1512
380
173
588
267
949
431
1231
559
1487
676
777
353
1577
717
542
247
380
173
469
213
546
248
239.9
109.0
256.3
116.5
272.7
124.0
390.6
177.6
444.8
202.2
498.9
226.8
84.4
38.4

100

128

160

180

45

58

73

82

WEIGHTS
Weights
M OD EL
DFC
DFB P
FIPI
FIPV
FIB G1
FIB G2
FIB G3
BEX
BM X
ASL
AIL
SAT1
SAT2
PEM 1
PEM 2
PEM 3
RH P
RH R
DSU
per 10" (250m m )
ATC
per 10" (250m m )
M otor Power
M otor W eight

MAH

12

16

24

32

40

50

62

80

100

120

150

200

250

320

400

450

lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg
lbs
kg

9
4
190
87
75
34
98
44
129
59
152
69
169
77
97
44
115
52
41
18
30
14
283
128
474
215
91
41
108
49
143
65
348
158
-

11
5
212
96
83
38
108
49
142
65
167
76
186
85
107
49
130
59
48
22
36
17
324
147
543
247
100
46
119
54
157
71
408
185
-

17
8
230
105
90
41
116
53
154
70
181
82
200
91
139
63
170
77
58
26
44
20
367
167
617
280
108
49
128
58
167
76
533
242
-

22
10
258
117
101
46
158
72
172
78
201
91
223
101
155
71
194
88
71
32
55
25
434
197
729
331
120
54
141
64
185
84
757
344
-

28
13
292
133
114
52
177
81
193
88
225
102
249
113
175
80
224
102
86
39
66
30
508
231
855
389
134
61
158
72
206
94
814
370
1003
456

35
16
312
142
121
55
212
96
205
93
239
109
264
120
188
85
246
112
99
45
77
35
564
256
949
431
141
64
166
76
217
99
962
437
1093
497

44
20
425
193
129
59
226
103
221
100
256
117
283
129
232
106
303
138
111
50
87
39
621
282
1047
476
149
68
176
80
230
105
1059
481
1112
506

56
25
561
255
153
70
280
127
273
124
319
145
354
161
285
130
384
175
133
61
105
48
753
342
1273
579
180
82
215
98
285
130
1297
589
1325
602

70
32
605
275
165
75
299
136
294
134
344
156
381
173
348
158
470
214
156
71
123
56
851
387
1441
655
192
87
229
104
303
138
1810
823
1501
682

84
38
816
371
190
87
351
160
346
157
405
184
450
204
411
187
556
253
182
83
144
66
995
452
1783
810
223
101
267
122
357
162
2212
1005
1806
821

105
48
904
411
209
95
383
174
381
173
445
202
493
224
452
206
627
285
214
97
171
78
1141
519
2043
929
243
110
291
132
387
176
2467
1121
2013
915

140
64
1239
563
262
119
459
209
463
210
535
243
590
268
600
273
823
374
272
124
218
99
1421
646
2513
1142
297
135
352
160
461
210
3632
1651
2522
1146

175
80
1515
689
302
137
529
240
537
244
621
282
684
311
698
317
973
442
327
149
263
120
1686
766
3051
1387
340
155
403
183
530
241
4206
1912
2962
1346

224
102
1666
757
333
151
576
262
595
270
686
312
754
343
754
343
1077
490
399
181
323
147
1988
903
3577
1626
369
168
437
199
573
261
6248
2840
3362
1528

280
127
2035
925
363
165
621
282
652
296
749
340
821
373
888
404
1278
581
479
218
389
177
2315
1052
4135
1880
395
180
468
213
613
279
8452
3842
3418
1554

315
143
2184
993
387
176
658
299
697
317
799
363
875
398
937
426
1362
619
530
241
431
196
2534
1152
4532
2060
419
190
495
225
648
294
9561
4346
3843
1747

lbs
kg
lbs
kg

9.3
4.2
5.4
2.4

10.5
4.8
6.5
2.9

11.3
5.2
6.5
2.9

12.8
5.8
7.3
3.3

14.5
6.6
9.0
4.1

15.4
7.0
9.0
4.1

16.3
7.4
9.0
4.1

18.3
8.3
11.0
5.0

19.6
8.9
11.0
5.0

21.7
9.8
13.0
5.9

23.8
10.8
14.6
6.7

26.8
12.2
15.8
7.2

30.2
13.7
19.2
8.7

33.2
15.1
20.3
9.2

35.8
16.3
20.3
9.2

38.1
17.3
22.5
10.2

KW
lbs
kg

0.55
20
9

0.75
20
9

1.1
28
13

1.5
32
15

2.2
54
24

3
54
24

4
65
29

5.5
99
45

7.5
110
50

11
185
84

15
209
95

18.5
260
118

22
277
126

30
528
240

For sections not mentioned, please consult SKM

MAH - Series
Page 19

GUIDE SPECIFICATIONS
Guide Specifications

•

Interior skin of the panels shall be made of perforated
galvanized steel, aluminum or stainless steel if so specified

General

•

Insulation thickness shall be 1” (25mm), 1.5” (38mm) or 2”
(50mm) (based on unit’s size and application).

Modular Air Handling Units (MAH) shall be factory assembled. To
meet project requirements, units may consist of a wide choice of
combinations of sections like fan, cooling coil, heating coil,
humidifier, filter, heat recovery system, sound attenuator, multi
zone, mixing box, return air fan, plenums, etc as indicated on the
equipment schedule.

•

Insulation density and thermal conductivity shall be 2 Ib/ft3
(32kg/m3) and 0.23 BTU.in/ft2.F.h.(0.033 W/m°k) respectively
and it shall be conformed to HH-1-545B type1, SMACNA
standard for duct liners and ASTM-C-423 and NFPA90A &
90B standard for fire resistance.
Following optional insulations shall be provided if so specified:

Units may be shipped fully or partially assembled in accordance
with jobsite requirements. Units shall be horizontal or vertical
arrangements as shown on attached drawings. Units shall be
installed at site as per Installation Operation & Maintenance
Manual.

Casing & Construction
•

MAH units casing shall be constructed of heavy-gauge steel
structure frame (so called Penta-Post) with horizontal and
vertical members and panels. Fixed panels shall be bolted to
the frame and removal of access panels shall not affect on
the structural integrity of the unit.

•

1” (25mm) or 2” (50mm) thick polyisocynurate board
with density in the range 2 - 3 lb/ft3 (32 - 48 kg/m3)and
thermal conductivity of 0.16 BTU.in/ft 2 .F.h.
(0.023 W/m°k).

•

1” (25mm) or 2” (50mm) thick polyurethane foam
injection board with density in the range of 2-3 lb/ft 3 and
thermal conductivity of 0.16 BTU.in/ft 2 .F.h
(0.023 W/m°k).

•

Units (up to size 100) shall be provided with painted steel
base frame. Larger units shall be provided with painted rigid
steel structure base frame.

•

Units shall be constructed to permit complete dismantling &
re-assembling at site.

•

All ceiling suspended units shall be provided with painted rigid
steel structure base frame.

•

Units casing shall be in galvanized or painted finish as
indicated on the equipment schedule.

•

Units for outdoor installation shall be provided with
weatherproof top cover.

•

Galvanized casing shall be made of hot-dip galvanized steel
sheets.

•

Painted casing shall be made of hot-dip galvanized steel
sheets. Fabricated steel shall be thoroughly de-greased and
then phosphatized before application of an average 60 micron
baked electrostatic polyester dry powder coating in RAL 7032
color scheme. This finish can pass 1000-hour, 5% salt spray
test at 95°F (35°C) and 95% relative humidity (ASTM B 117/
95).

•

Units casing shall be made of stainless steel or aluminum if
so specified.

•

All access panels shall be provided with quick release
fasteners and handles.

•

In addition to quick release fasteners and handles, all access
panels shall be provided with hinges if so specified.

•

To ensure air tightness and to avoid thermal bridges, all panels
shall be provided with closed-cell foam gaskets.

•

All panels and frames shall be internally insulated.

•

To prevent insulation erosion into air stream, the unit shall be
provided with double wall panels “Double Skin”, if so specified.
Interior skin of the panels shall be made of hot dip galvanized
steel.

•

Fan Section
•

Fan shall be double width, double inlet, multi blades, and
centrifugal type wheels.

•

Fan shall be statically & dynamically balanced and tested in a
registered laboratory in accordance with AMCA standard 210.

•

Fan blades shall be forward curved or backward inclined or
backward inclined air foil as indicated on the equipment
schedule

•

Forward curved blades shall be made of galvanized steel.
Fan shaft shall be made of C-45 carbon steel with an anti
corrosion varnish.

•

Backward inclined blades shall be made of mild steel finished
with epoxy paint. Fan shaft shall be made of C-45 carbon
steel with an anti corrosion varnish.

•

Backward inclined airfoil blades shall be made of corrosion
resistance steel coated with an anti corrosion primer and a
final layer of synthetic paint. Fan shaft shall be made of
hardened steel, precision ground and polished with protection
paint.

MAH - Series
Page 20

GUIDE SPECIFICATIONS
•

Fan impeller shall be keyed to fan shaft to prevent slipping.

•

Fan bearings shall be ball type, hermetically sealed, selfaligning with eccentric ring for clamping to the shaft.
Fan shaft shall be stainless steel if so specified.

•
•

Flexible connection shall be provided between fan discharge
and casing panel.

•

Fan motor shall be mounted inside fan section on adjustable
base. Motor shall be totally enclosed fan cooled (TEFC), foot
mounted, 4 poles, IP-55 protected with class-F insulation.

•

Motor size and electrical characteristics shall be as indicated
on the equipment schedule.

•

To limit transmission of noise and vibration, the complete fan
motor subassembly shall be mounted on rubber in shear
isolators.

•

The complete fan motor subassembly shall be mounted on
1” (25mm) deflection spring isolators if so specified.

•

Stand by motor with manual change over, spark proof fan,
explosion proof motor, fan with polygly coating, belt guard
shall be provided if so specified.

•

Fan shall be belt-driven by using anti static belts and
adjustable pitch drives.

•

For variable air volume controls, fan with inlet guide vanes or
variable frequency drive shall be installed as indicated on the
equipment schedule.

tubes to fins. Fins shall have drawn collars.
•

Optional copper fins, electro-tinned coils or coils with
protective coating shall be provided if specified.

•

Maximum fins spacing shall be 12 fpi (2.1mm).

•

Coil shall be assembled in slide-in guides for easy removal.

•

Coil connections shall be sweat type. Optional MPT, FPT or
flanged connections shall be provided if so specified.

•

Coil shall be rated in accordance with ARI - 410 and tested
by compressed air under water to the pressure of 300 psig
(21.09kg/cm2).

•

Cooling coil shall be provided with drain pan to remove the
condensate formed during the dehumidification. Drain pan
shall be constructed of 1.5 mm (for models 12-200) or 2.0
mm (for models 250-450) thick zinc coated steel sheets,
painted and insulated from outside with minimum1” (25mm)
thick fiberglass insulation. To meet the requirement of
ASHRAE Standard 62, the bottom of drain pan shall be
tapered sloping towards the center and its connection shall
be MPT (schedule 40 MS pipe).

•

Drain pan shall be provided with one connection (for models
12 - 200) or two connections (for models 250 - 450).

•

Drain pan shall be constructed of stainless steel if so specified.

•

Drain pan shall be constructed such that coil headers & Ubends are enclosed by it.

•

Moisture eliminator shall be provided if so indicated on the
equipment schedule.

•

Eliminator blades shall be made of PVC with specially
designed shape to trap water droplets.

•

Eliminator blades shall be made of stainless steel if so
specified.

Coil Section
•

Chilled water, hot water, steam & DX coils shall be provided
as indicated on the equipment schedule.

•

Coil shall be constructed of seamless copper tubes of
3/8” (9.5mm) (for models 12-62) or 5/8” (15.9mm) (for models
80 - 450) outside diameter arranged in a staggered form.

•

All water coils shall be provided with automatic air vents and
drain plugs.

•

DX coil shall be provided with distributor. Expansion valve
shall be provided if so specified.

•

Coil circuiting shall be counter flow. (Direction of coil water /
refrigerant flow shall be counter to direction of unit airflow).

•

Supply and return water connections of coil section shall be
labeled with “WATER IN” & “WATER OUT” respectively.
DX coil section shall be labeled with “LIQUID” & “SUCTION”.

•
•

Coil connections shall be sealed against unit panels by flexible
closed cell gasket.

•

Coil tubes shall be mechanically expanded into continuous
corrugated aluminum fins to provide compression bond of

Filter Section
•

Filter type & efficiency shall be as indicated on the equipment
schedule.

•

Filter section of MAH shall be constructed to accommodate
one or more of the following filters :
•
Panel Filter :

MAH - Series
Page 21

Thickness : 2” - 4” (50mm - 100mm)
Media : Washable Aluminum
Form : Flat
Average dust arrestance based
on ASHRAE test # 52/76 : 75 %
Thickness : 2” (50mm)
Media : Disposable Synthetic
Form : Flat
Average dust arrestance based

GUIDE SPECIFICATIONS
on ASHRAE test # 52/76 : 87 %
Thickness : 2” (50mm)
Media : Blend of non woven cotton and polyster
Form : Pleated
Average dust arrestance based
on ASHRAE test # 52/76 : 93 %

•

Control panel for remote installation shall be provided if so
specified.

•

Humidification capacity and efficiency shall be as indicated
on the equipment schedule.

•

Thickness : 2” (50mm)
Media : Washable Synthetic
Form : Pleated
Average dust arrestance based
on ASHRAE test #52/76 : 94 %

The humidifier type shall be steam or water as specified on
the equipment schedule.

•

Steam humidifier section shall be complete with drain pan
and steam distribution pipe. The steam generator with its
accessories shall be installed on the external wall of the unit
or supplied loose for remote installation to the unit.

•

V Filters : Filters shall be arranged in a V bank to increase
the filtration area. Media options are the same as in flat
form panel filters.

•

Water humidifier section shall be consisting of water tank,
pump, spray nozzles, heat exchanger media, control valves
and water droplet eliminator.

•

Bag Filters : Bag filter media shall be 22” (559mm), 30”
(762mm) or 36” (914mm) deep with average dust spot
efficiency (opacimetric measure) 85% or 95% as per
ASHRAE test # 52/76.

To control the fresh, return and exhaust airflow rates in mixing
box, exhaust box, economizer, face & bypass and multi-zone
sections, MAH units shall be provided with dampers.

•

Damper shall be arranged in parallel or opposed blades
configuration.

•

Auto roll & sand inertia filters shall be provided if so
specified.

Damper frame, shaft, linkages and brackets shall be
constructed of galvanized steel.

•

To monitor air pressure drop across filter, manometers
shall be provided if so specified.

Damper blades shall be constructed of galvanized steel or
aluminum in airfoil design.

•

Damper blades shall be constructed of stainless steel if so
specified.

•

Damper blades shall be rotate in bronze bearings which
lubrication is not required.

4” (100mm) thick extended surface Mini - Pleat filters
with equivalent efficiency to bag filter shall be provided if
so specified.

•

HEPA Filters : Ultra high absolute HEPA filter media shall
be 12” (300mm) deep with efficiency >99% when
measured by using DOP method.

•

Dampers
•

•

•

Electric Heater section
•

Electric heater capacity and steps shall be as indicated on
the equipment schedule.

•

Electric heater element shall be constructed from 80/20 nickel
chrome resistance wire, which is connected to terminal pins
and centered in stainless steel grade 304L sheath metal tubes
by compressed magnesium oxide. The terminal pins shall be
insulated from metal tube by ceramic bushes. Helical fins mild
steel galvanized shall be tightly wounded around tabular
heater elements. Helical fins stainless steel shall be provided
if so specified.

•

Control panel consisting of all controls shall be provided as
integral part of the unit.

Humidifier Section

Thickness : 2” (50mm)
Media : Washable Synthetic
Form : Flat
Average dust arrestance based
on ASHRAE test # 52/76 : 93 %

•

•

Electric heater batteries shall be supplied with primary and
secondary manual safety cutouts.

Sound Attenuator Section
•

Sound attenuator section shall be sized to meet the sound
level indicated on the equipment schedule.

•

Sound attenuator section shall be consisting of splitters with
24” (600mm) or 48” (1200mm) in lengths.

•

Outer skin of the splitters shall be constructed of perforated
galvanized steel.

•

Outer skin of the splitters shall be constructed of perforated
aluminum or stainless steel if so specified.

Electric heater batteries shall be supplied with contactors,
fuses, disconnect switch and airflow switch if so specified.

MAH - Series
Page 22

GUIDE SPECIFICATIONS
•

will be improved.

The insulation material of splitters shall be fiberglass.

Heat Recovery Section
To conserve the energy consumption, one of the following heat
recovery systems shall be provided:
•

•

Rotary heat recovery system (Thermal wheel): Sensible &
latent heats can be recovered and Indoor Air Quality (IAQ)
will be improved by maintaining the humidity. Over 85 %
energy recovery can be achieved. The wheel matrix shall be
constructed of pure aluminum foil. The wheel shall be rotate
in a relatively low speed (15–25 RPM). The wheel rotor shall
be supported by two pillow block bearings to maintain /
replace without actual removal of the rotor from its casing.
Run around coil system: This system consists of two coils,
pump and interconnecting piping. It recovers sensible heat
only and it can reduce the differential in temperature between
supply and exhaust air by as much as 60 %.

•

Fixed plate heat recovery system (Plate heat exchanger): It
shall be built from aluminum plates or stainless steel if so
specified. It recovers sensible heat only and its efficiency is
up to 70 %.

•

Heat pipe system: This system shall be installed in which one
side to be replaced in the warm return air and the other side
in the cold supply air. By using this system, in addition to
significant energy savings, the dehumidification capacity will
be increased, the cooling load on the evaporator and
compressor will be decreased and Indoor Air Quality (IAQ)

MAH - Series
Page 23