The Combination Fire/Smoke Dampers combine two dampers in one. The two-position device is tested to 5,000 cycles, intended to prevent the spread of fire (UL 1-1/2-hour fire rating), as well as smoke (UL Class II 350 F leakage rating). Johnson Controls
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The Combination Fire/Smoke Dampers combine two dampers in one. The two-position device is tested to 5,000 cycles, intended to prevent the spread of fire (UL 1-1/2-hour fire rating), as well as smoke (UL Class II 350 F leakage rating). Johnson Controls
