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
Double Section
Single Section
| 50 in. |
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50 in. | (1270mm) | ( |
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(1270mm) |
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| 32 in. (813mm) | 64 in. (1626mm) |
| 32 in. (813mm) |
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Transitioned Damper Dimensions
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
D*+ 2 in. ( |
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51mm) +T | s |
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| W*+ 2 | in. (51mm)+T | s |
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D* + 2 in. (51mm)+T |
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| 21/8 in. |
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21/8 in. H* (54mm) 
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21/8 in. H*
(54mm) 
16 in. (406mm) Min. 
D*
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16 in. (406mm) | 16 in. (406mm) | |
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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 & 105 and further shall be tested, rated and labeled in accordance with the latest edition of UL Standards 555S. Dampers shall have a low leakage design qualified to UL555S Leakage Class I.
Each damper /actuator combination shall have a UL555S elevated temperature rating of 250°F (121°C) minimum and shall be opera- tional 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 mini- mum (30 psi maximum) operation.
Damper blades shall be 16 ga. (1.5mm) galvanized steel 3V type with three longitudinal grooves for reinforcement. 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.
The Damper Manufacturer's submittal data shall certify all air perfor- mance 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 data shall be developed in accordance with the lat- est edition of AMCA Standard
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
Copyright ©2006 Greenheck Fan Corporation