Corridor dampers are tested in accordance to UL555 and are Class 1 and Class 2 leakage rated per UL555S. The dampers are for use where air ducts penetrate or terminate at horizontal openings in the ceilings of wood stud or metal stud constructed interior tunnel corridors.
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DFSDR1:
UL Classified 1 hr. Class I, Corridor Damper
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FSD36C:
UL Classified 1 hr. Class II, V-Groove Blade, Corridor Damper
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FSD60C:
UL Classified 1 hr. Class I, Airfoil Blade, Corridor Damper
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FSDR25C:
UL Classified 1 1/2 hr. Class I, Round Corridor Damper
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