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 figure shows the size damper section that has been qualified for operation with a single actuator. Larger sizes can be accommodated using multiples of these assembles.
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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 further shall be 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 (121°C) minimum and shall be rated to operate at maximum design airflow 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 240 Volt operation or pneumatic type for 25 psi minimum (30 psi maximum operation.
Damper blades shall be hollow extruded aluminum airfoil type with structural reinforcing tube running full length of each blade. 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.
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 ©2007 Greenheck Fan Corporation
