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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 maximum damper section size and assembly configurations for multi-section dampers.
Single Section
50 in.
(1270mm)
Transitioned Damper
Dimensions
16 in. (406mm)
Min.
TYPE R
*
These dimensions are furnished approximately
T s = (2)(Sleeve Thickness)
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 requirements of NFPA 92A,
92B, 101 & 105 and further shall be tested, rated and labeled in
accordance with the latest edition of UL Standards 555S. Dampers
shall have a low leakage design qualified to UL555S Leakage Class I.
Each damper /actuator combination shall have a UL555S elevated
temperature rating of 250°F (121°C) minimum and shall be opera-
tional 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 120 (24 or 230) Volt operation or pneumatic type for 25 psi mini-
mum (30 psi maximum) operation.
Damper blades shall be 16 ga. (1.5mm) galvanized steel 3V type with
three longitudinal grooves for reinforcement. Damper frame shall
be galvanized steel formed into a structural hat channel shape with
reinforced corners. Bearings shall be sintered bronze sleeve type
rotating in extruded holes in the damper frame. Blade edge seals
Double Section
50 in.
(1270mm)
32 in. (813mm)
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
SMD-201 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.
1
2
/
in.
8
(54mm)
16 in. (406mm)
100 in.
Min.
(2540mm)
1
/
in. (6mm) undersize, except round and oval dimensions which are approximately
4
50 in.
(1270mm)
32 in. (813mm)
32 in. (813mm)
64 in. (1626mm)
H*
2
1
/
in.
8
(54mm)
TYPE O
128 in. (2540mm)
shall be silicone 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. Blades shall
be completely symmetrical relative to their axle pivot point, present-
ing identical resistance to airflow in either direction or pressure on
either side of the damper.
The Damper Manufacturer's submittal data shall certify all air perfor-
mance pressure drop data is licensed in accordance with the AMCA
Certified Ratings Program for Test Figures 5.2, 5.3, and 5.5. Damper
air performance data shall be developed in accordance with the lat-
est edition of AMCA Standard 500-D. Dampers shall be labeled with
the AMCA Air Performance Seal.
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.
The basis of design is Greenheck Model SMD-201.
50 in.
(1270mm)
32 in. (813mm)
2
1
/
8
(54mm)
16 in. (406mm)
Min.
TYPE C
1
/
in. (3mm) undersize.
8
Copyright ©2006 Greenheck Fan Corporation
SMD-201 Rev. 4 June 2006
96 in. (2435mm)
H*
in.
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