36 in.
32 in. (813mm)
30 in. (762mm)60 in. (1524mm)
50 in.
96 in. (2435mm)
50 in.
100 in.
(1270mm)
32 in. (813mm)
(2540mm)
(1270mm)
32 in. (813mm)
128 in. (2540mm)
(914mm)
48 in.
(1219mm)
Single Section
Double Section
Combination Fire 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 80, 90A, 92A, 92B, 101, and 105 and further
shall be tested
, rated and labeled in accordance with the latest
edition of UL Standards 555 and 555S. Dampers shall have a UL555
fire rating of 3 hours and be of low leakage design qualified to
UL 555S Leakage Class I.
Each damper /actuator combination shall have a UL555S elevated
temperature rating of 350° F (177°C) minimum and shall be
operational and dynamic 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 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) and be UL 555S rated for leakage and airflow in either
direction through the damper. Each damper shall be supplied with
a 165°F (74°C) RRL. Testing and ratings to be in accordance with
AMCA standard 500-D.
The basis of design is Greenheck Model FSD-331.
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.
specifications
Transitioned damper
dimensions
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
FSD-331 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.
Ts = (2)(Sleeve Thickness)
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 © 2008 Greenheck Fan
Corporation
FSD-331 Rev 1 March 2008
