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
Multi Section
Single Section
30”
30”
24” 48”
24”
Transitioned Damper Dimensions
D*+ 2 in. ( |
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51mm) +T | s | |
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When a fire/smoke damper is being used in conjunction with round or oval ductwork, the
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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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16 in. (406mm) | D* | 16 in. (406mm) |
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Min. |
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TYPE R
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21/8 in. |
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(54mm) |
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W*
16 in. (406mm) Min.
TYPE O
21/8 in. H*
(54mm) 
W*
TYPE C
Specifications
*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)
Combination Fire 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 the latest edition of NFPA 80, 90A, 92A, 92B, 101, & 105 and further shall be tested in accordance with the latest edition of UL Standards 555 and 555S. Dampers shall have a UL 555 fire rating of 1½ hours and be of 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 operational and dynamic 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.
The Damper Manufacturers 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 data shall be developed in accordance with
the latest edition of AMCA Standard
Damper blades shall be 16 ga. (1.5mm) 316 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
All UL 555 and 555S Dynamic Closure Ratings, Operational Ratings and Leakage Ratings shall be qualified for airflow and pressure in either direction through the damper. UL ratings shall allow for mounting damper vertically (with blades running horizontal) or horizontally.
Basis of design is Greenheck Model
Copyright © 2008 Greenheck Fan Corporation
