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Transitioned Damper
Dimensions
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
SMD-302 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 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 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 sintered bronze 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
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-302.
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 assembles.
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 ©2006 Greenheck Fan Corporation
SMD-302 Rev. 4 June 2006