Damper Sizing Information
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.
Single Section | Multi Section |
50 in. (1270mm)
50 in. (1270mm)
32 in. (813mm) 64 in. (1626mm)
Transitioned Damper Dimensions
32 in. (813mm)
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
D*+ 2 in. ( |
|
|
|
|
|
|
|
| |
51mm) +T | s |
| W*+ | 2 in. (51mm)+T |
| ||||
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
| s | |
|
|
|
| W*+ 2 | in. (51mm)+T | s |
|
| |
|
|
|
|
|
|
|
|
|
|
D* + 2 in. (51mm)+T |
| s |
| H*+ 2 in. (51mm)+T | s | ||
|
|
|
| ||||
|
|
|
| 21/8 in. |
|
|
|
|
|
|
| (54mm) |
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
21/8 in. H* (54mm) 
H* + 2 in. (51mm)+T | s |
|
21/8 in. H*
(54mm) 
16 in. (406mm) Min. 
D*
| W* |
16 in. (406mm) | 16 in. (406mm) |
Min. | Min. |
W*
TYPE R | TYPE O | TYPE C |
*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)
Specifications
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
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
The basis of design is Greenheck’s model
Copyright ©2006 Greenheck Fan Corporation
