Model SMd-302M
Smoke dampers
Steel Airfoil Blades
UL 555S Leakage Class II
APPLICATION
Model SMD-302M meets the requirements for
smoke dampers established by:
Model SMD-302M is a leakage rated modulating smoke damper
with class II leakage. The SMD-302M serves the function of both
a control damper and smoke damper. High strength airfoil blades
insure lowest resistance to airflow in HVAC systems with velocities
to 2000 fpm (10.2m/s) and 4 in. wg (1 kPa) Model SMD-302M may
be installed vertically (with blades running horizontal) or horizontally
and is rated for airflow and leakage in either direction.
National Fire Protection Association
NFPA Standards 92A, 92B, 101 & 105
IBC International Building Codes
New York City (MEA listing #260-91-M)
CSFM California State Fire Marshal
Leakage (Smoke) Damper Listing (#3230-0981:104)
UL 555S Leakage Rating
Leakage Class:
Operational Rating
Maximum Velocity:
Maximum Pressure:
II
2000 fpm (10.2m/s)
4 in. wg (1 kPa)
“UL CLASSIFIed (see complete marking on
product)”
“UL CLASSIFIed to Canadian safety standards
(see complete marking on product)”
Standard 555S (Listing #R13317)
Maximum Temperature:250ºF (121ºC)
STANdARd CONSTRUCTION
Frame:
5 in. x 1 in. (127mm x 25mm)
galvanized steel hat channel with
reinforced corners. A low profile
head and sill are used on sizes less
than 17 in. (432mm) high to
maximize free area and
Greenheck Fan Corporation certifies that the
model SMD-302M shown herein is licensed
to bear the AMCA Seal. The ratings shown
are based on tests and procedures performed
in accordance with AMCA Publication 511
and comply with the requirements of the
AMCA Certified Ratings Programs. The
performance.
Blades:
Seals:
Double skin airfoil shape of
galvanized steel with full length
structural reinforcement. 14 ga.
(2 mm) equivalent thickness.
Extruded silicone rubber blade
seals. Flexible stainless steel jamb
seals.
R
AMCA Certified Ratings Seal applies to air
performance ratings only.
Linkage:
Axles:
Bearings:
Concealed in jamb.
1/2 in. (13mm) dia. plated steel.
Bronze sleeve type.
SIze LIMITATIONS:
Minimum Size:
8 in. W x 6 in. H
(203mm W x 152mm H)
Maximum Size:
Single Section:
32 in. W x 50 in.H
(813mm W x 1270mm H)
128 in. W x 100 in. H
(3251mm W x 2540mm H)
Multiple Section:
LH
Optional Features:
• Galvanized steel sleeves.
• Stainless steel bearings
H*
• OCI (Open closed indication switches)
• Electric or pneumatic actuators to accomplish smoke
management and system functions.
W*
• Transitions (R, C, O)
• POC retaining angles
• Momentary Switch
RH
• Smoke detectors
• Sealed transitions and sleeves
1
*W&H dimensions furnished approximately /4 in. (6mm) undersize.
Right hand drive is shown. Left hand drive is available upon request.
Damper also may be rotated 180° in the field for opposite side drive.
(Add sleeve thickness for overall sleeved damper dimension)
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AMCA 5.2 Pressure drop
SMd-302M
5D
36x36
12x48
48x12
12x12
24x24
* Sizes are in inches.
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
500
0.03
0.12
0.26
0.46
0.72
1.04
1.41
1.84
500
0.01
0.06
0.12
0.22
0.34
0.49
0.67
0.87
500
0.01
0.06
0.12
0.22
0.34
0.49
0.67
0.88
500
0.01
0.05
0.12
0.21
0.33
0.48
0.65
0.85
500
1000
1500
2000
2500
3000
3500
4000
0.02
0.08
0.18
0.33
0.51
0.74
1.00
1.31
1000
1500
2000
2500
3000
3500
4000
1000
1500
2000
2500
3000
3500
4000
1000
1500
2000
2500
3000
3500
4000
1000
1500
2000
2500
3000
3500
4000
Greenheck Fan Corporation certifies that the
model SMD-302M shown herein is licensed
to bear the AMCA Seal. The ratings shown
are based on tests and procedures performed
in accordance with AMCA Publication 511
and comply with the requirements of the
AMCA Certified Ratings Programs. The
AMCA Certified Ratings Seal applies to air
performance ratings only.
R
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AMCA 5.3 Pressure drop
SMd-302M
5D
6D
24x24
12x12
36x36
48x12
12x48
* Sizes are in inches.
Pressure Drop
Pressure Drop
Pressure Drop
Pressure Drop
Pressure Drop
Velocity (fpm)
(in. wg)
Velocity (fpm)
(in. wg)
Velocity (fpm)
(in. wg)
Velocity (fpm)
(in. wg)
Velocity (fpm)
(in. wg)
500
1000
1500
2000
2500
3000
3500
4000
0.01
0.06
0.13
0.23
0.37
0.53
0.73
0.95
500
0.01
0.02
0.06
0.10
0.16
0.23
0.32
0.42
500
1000
1500
2000
2500
3000
3500
4000
0.01
0.02
0.05
0.09
0.14
0.21
0.29
0.38
500
1000
1500
2000
2500
3000
3500
4000
0.01
0.02
0.06
0.10
0.16
0.24
0.33
0.43
500
0.01
0.04
0.10
0.18
0.29
0.42
0.57
0.74
1000
1500
2000
2500
3000
3500
4000
1000
1500
2000
2500
3000
3500
4000
Greenheck Fan Corporation certifies that the
model SMD-302M shown herein is licensed
to bear the AMCA Seal. The ratings shown
are based on tests and procedures performed
in accordance with AMCA Publication 511
and comply with the requirements of the
AMCA Certified Ratings Programs. The
AMCA Certified Ratings Seal applies to air
performance ratings only.
R
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AMCA 5.5 Pressure drop
SMd-302M
36x36
48x12
12x12
12x48
24x24
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
Velocity
(fpm)
Pressure Drop
(in. wg)
Velocity
(fpm)
Pressure Drop
(in. wg)
(in. wg)
500
1000
1500
2000
2500
3000
3500
4000
0.04
0.18
0.42
0.75
1.17
1.68
2.29
2.09
500
1000
1500
2000
2500
3000
3500
4000
0.03
0.13
0.29
0.52
0.81
1.17
1.60
2.14
500
1000
1500
2000
2500
3000
3500
4000
0.03
0.12
0.27
0.48
0.75
1.08
1.48
1.93
500
1000
1500
2000
2500
3000
3500
4000
0.03
0.12
0.27
0.49
0.77
1.11
1.51
1.97
500
1000
1500
2000
2500
3000
3500
4000
0.03
0.14
0.32
0.57
0.89
1.28
1.75
2.29
Greenheck Fan Corporation certifies that the
model SMD-302M shown herein is licensed
to bear the AMCA Seal. The ratings shown
are based on tests and procedures performed
in accordance with AMCA Publication 511
and comply with the requirements of the
AMCA Certified Ratings Programs. The
AMCA Certified Ratings Seal applies to air
performance ratings only.
R
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Application data
damper Sideplate and Sleeve dimensional data
The drawings below illustrate the factory standard sideplate and sleeve mountings for the SMD-302M. The standard "A" di-
mensions listed in the table provide adequate space for the mounting of actuators and controls.
3
If space constraints are a problem the "A" dimension can be varied between 5 /8 in. (136mm) and 12 in. (305mm).
Sleeve
1
1
/2" max.
Sideplate
"A" dimension
in. (mm)
Sleeve
Standard
Sideplate
Maximum
12 (305)
All Dampers*
7 3/16 (183)
6 3/16 (157)
33/4"
When height is
11 in. (279) or
less with OCI
11 3/16
(284)
12
(305)
10 3/16
(259)
6 in.
*With the exception of dampers 11 in. (279mm) high or less (12 in.
(305mm)high or less if width is greater than 64 in. (1625mm)) with OCI
option.
Varies
53/8"
** On dampers 11 in. (279mm) high or less (12 in. (305mm)high or less if
width is greater than 64 in. (1625mm)) with OCI option, sideplate is 16 in.
(406mm)
5 in.
A
5"
Sleeve Length
A
12 in.**
Space envelopes Required for Actuators
T*
S
and Accessories
Externally mounted actuators always require space
outside of the damper sideplate or sleeve. The “S” dimen-
sion illustrates the clearance required for various available
actuators.
On dampers less than 18 in. (457mm) high, actuators may
also require clearances above and/or below the sideplate
or sleeve. “B” and “T” dimensions are worst case clear-
ance requirements for some dampers less than 18 in.
(457mm) high. All damper sizes under 18 in. (457mm) high
do not require these worst case clearances. If space avail-
ability above or below the damper sleeve is limited, each
damper size should be individually evaluated.
B*
B*
T*
Actuator Type/Model
S
With OCI, RRL,
or TOR
With OCI, RRL,
or TOR
24 Volt AC
MS7520A2015/B
MS7520A2213/B
6 in. (152mm)
3/8 in. (10mm)
6 in. (152mm)
* For dampers 18 in. (457mm) or more in height these dimensions are 0 in.
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damper Sizing Information
Dampers larger than maximum single section size are supplied as a factory assembly of two or more sections of equal size.
The following figures show damper sections and assemblies that have been qualified for operation with a single actuator.
Larger sizes can be accommodated using multiples of these assemblies.
Double Section
Single Section
50 in.
(1270mm)
50 in.
(1270mm)
32 in. (813mm)
64 in. (1626mm)
32 in. (813mm)
Transitioned damper When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
SMD-302M can be supplied in a factory sleeve with round or oval transitions on both ends of
the sleeve. Dampers should be ordered to the duct dimensions. Drawings below show overall
damper size.
dimensions
D*+
2 in. (51mm) +T
s
W*+ 2 in. (51mm)+T
s
W*+ 2 in. (51mm)+T
s
D*+ 2 in. (51mm)+T
s
H*+ 2 in. (51mm)+T
H*+ 2 in. (51mm)+T
s
s
H*
H*
21/8in.
21/8in.
(54mm)
21/8in.
(54mm)
(54mm)
*
W
W*
These dimensions are furnished
*
D*
16 in. (406mm)
Min.
16 in. (406mm)
Min.
16 in. (406mm)
Min.
approximately 1/4 in. (6mm) undersize,
except round and oval dimensions
which are approximately 1/8 in. (3mm)
undersize.
TYPE R
TYPE O
TYPE C
T
= (2)(Sleeve Thickness)
s
Specifications
Smoke Dampers meeting the following specifications shall
be furnished and installed where shown on plans and/or as
described in schedules. Dampers shall meet the require-
ments of NFPA 92A, 92B, 101, and 105 and further shall
be tested, rated and labeled in accordance with the latest
edition of UL Standard 555S. Smoke dampers shall be of low
leakage design qualified to UL 555S Leakage Class II.
shall have an equivalent metal thickness of 14 ga. (2mm)
Damper frame shall be galvanized steel formed into a struc-
tural hat channel shape with reinforced corners. Bearings
shall be sintered bronze sleeve type rotating in extruded
holes in the damper frame. Blade edge seals shall be sili-
cone rubber designed to inflate and provide a tighter seal
against leakage as pressure on either side of the damper
increases. Jamb seals shall be stainless steel compression
type with silicone rubber backing. Blades shall be complete-
ly symmetrical relative to their axle pivot point, presenting
identical resistance to airflow in either direction or pressure
on either side of the damper.
Each damper/actuator combination shall have a UL555S
elevated temperature rating of 250°F (121º C) minimum and
shall be rated to operate at maximum design air flow at its
installed location. Each damper shall be supplied with an
appropriate actuator installed by the damper manufacturer
at the time of damper fabrication. Damper actuator shall be
(specifier select one of the following) electric type for 24 Volt
operation.
Damper must be rated for mounting vertically (with blades
running horizontal) or horizontally and be UL 555S rated for
leakage and airflow in either direction through the damper.
Damper blades shall be of the double skin airfoil type and
The basis of design is Greenheck Model SMD-302M.
Copyright ©2007 Greenheck Fan Corporation
SMD-302M Rev. 6 April 2007
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