Transitioned Damper Dimensions
When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
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21/8 in. H* (54mm) 
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21/8 in. H*
(54mm) 
16 in. (406mm) Min. 
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16 in. (406mm) | 16 in. (406mm) | |
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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 shall be further tested, rated and labeled in accordance with the latest edition of UL Standard 555S. Smoke dampers shall be of low leakage design qualified to UL 555S Leakage Class I.
Each damper /actuator combination shall have a UL555S elevated temperature rating of 250°F (121º C) minimum and shall be 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 metal thickness of 14 ga. (2mm) Damper frame shall be galvanized steel formed into a structural hat channel shape with reinforced corners.
Bearings shall be 304 stainless steel 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 vertical) and be UL 555S rated for leakage and air- flow in either direction through the damper.
The Damper manufacturer's submittal data shall certify all air performance pressure drop data is tested 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 latest edition of AMCA Standard
The basis of design is Greenheck Model
Copyright ©2007 Greenheck Fan Corporation
