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Transitioned Damper Dimensions
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the SMD-301V 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.
*
These dimensions are furnished approximately
1
/4 in. (6mm) undersize, except round and oval dimensions which are approximately
1
/8 in. (3mm) undersize.
T
s
= (2)(Sleeve Thickness)
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 shall be
further 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 I.
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 120 (24
or 230) volt operation or pneumatic type for 25 psi minimum
(30 psi maximum) operation.
Damper blades shall be of the double skin airfoil type
and shall have an equivalent metal thickness of 14 ga.
(2mm) Damper frame shall be galvanized steel formed into
a structural hat channel shape with reinforced corners.
Bearings shall be 304 stainless steel sleeve type rotating
in extruded holes in the damper frame. Blade edge seals
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, presenting identical
resistance to airflow in either direction or pressure on either
side of the damper.
Damper must be rated for mounting vertically (with blades
running vertical) and be UL 555S rated for leakage and air-
flow in either direction through the damper.
The Damper manufacturer's submittal data shall certify all
air performance pressure drop data is tested 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 latest edition of AMCA
Standard 500-D.
The basis of design is Greenheck Model SMD-301V.
Specifications
D* +
2 in. (51mm) +T
s
D*
TYPE R
16 in. (406mm)
Min.
2
1
/
8
in.
D* + 2 in. (51mm)+T
s
TYPE O
W
*
H*
W*
+ 2 in. (51mm)+T
s
H* + 2 in. (51mm)+T
s
W*
H*
TYPE C
H* + 2 in. (51mm)+T
s
(54mm)
16 in. (406mm)
Min.
2
1
/
8
in.
(54mm)
16 in. (406mm)
Min.
W* + 2 in. (51mm)+T
s
(54mm)
2
1
/
8
in.
Copyright ©2007 Greenheck Fan Corporation
SMD-301V Rev 3 June 2007