50 in.
32 in. (813mm)
32 in. (813mm) 64 in. (1626mm)
50 in.
96 in. (2435mm)
50 in.
100 in.
(1270mm)
32 in. (813mm)
(2540mm)
(1270mm)
32 in. (813mm)
128 in. (2540mm)
(1270mm)
50 in.
(1270mm)
Single Section
Double Section
Combination Fire Smoke Dampers meeting the following specifica-
tions 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 & 105 and further shall be teste
d
, rated
and labeled in accordance with the latest edition of UL Standards
555 and 555S. Dampers shall have a UL555 fire rating of 1½ hours
and 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 (121°C) minimum and shall be opera-
tional and dynamic rated to operate at maximum design air flow at
its installed location. Each damper shall be supplied with an appro-
priate 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, present
-
ing 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. Each damper shall be
supplied with a 165°F (74°C) RRL. Testing and ratings to be in ac
-
cordance with AMCA standard 500-D.
The basis of design is Greenheck Model FSD-312.
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-312 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 over-
all 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)
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 © 2006 Greenheck Fan Corporation
FSD-312 Rev 3 June 2006
