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Greenheck Combination Fire Smoke Damper FSD-211 Specification Sheet (7 pages)
Combination fire smoke dampers steel 3-v blades ul 555s leakage class i ul555 11⁄2 hour fire resistance rating
Greenheck FSD-312 Specifications (7 pages)
Combination fire smoke dampers steel airfoil blades ul 555s leakage class ii ul555 1 1/2 hour fire resistance rating