Filter
Top Products
Transitioned Damper
Dimensions
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
SSSMD-201 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 and 105 and further shall be tested, rated and labeled in
accordance with the latest edition of UL Standards 555S. Dampers
shall be UL labeled for use in dynamic systems.
Dampers shall have a UL555S leakage rating of Class I and a
temperature rating of 250ºF (121ºC) minimum. Dampers shall have a
UL555S operational airflow rating equal to or greater than the airflow
at its installed location and an operational pressure rating of 4 in. wg
(1 kPa). Damper actuators shall be factory mounted and qualified for
use with the damper in accordance with UL555S. Damper actuators
shall be (specifier select one of the following) electric type for 120V,
24V, 230 volt operation or pneumatic type for 25 psi minimum (30 psi
maximum) operation. Manufacturer’s submittal data shall indicate
actuator space requirements around the damper.
Damper blades shall be 16 ga. (1.5mm) 304 stainless steel 3V type
with three longitudinal grooves for reinforcement. Blades shall be
completely symmetrical relative to their axle pivot point, presenting
identical resistance to airflow and operation in either direction
through the damper (blades that are non-symmetrical relative to
their axle pivot point or utilize blade stops larger than 0.5 in. are
unacceptable).
Damper frames shall be 16 ga. (1.5mm) 304 stainless steel formed
into a structural hat channel shape with reinforced corners. Bearings
shall be stainless steel type rotating in extruded holes in the damper
frame. Jamb seals shall be stainless steel compression type.
The Damper manufacturer’s submittal data shall certify all air
performance pressure drop data is licensed in accordance with the
AMCA certified ratings program for test figures 5.2, 5.3, and 5.5.
Damper air performance shall be developed in accordance with the
latest edition of AMCA Standard 500-D.
The basis of design is Greenheck’s model SSSMD-201.
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
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)
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 Multi Section
Damper Sizing Information
Copyright ©2006 Greenheck Fan Corporation
SSSMD-201 Rev 5 July 2006