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Transitioned Damper
Dimensions
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.
*
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 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.
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 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 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.
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-302M.
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.
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.
Single Section
Double Section
Copyright ©2007 Greenheck Fan Corporation
SMD-302M Rev. 6 April 2007