Products
Combination Fire & Smoke Dampers
CVS-SAFE4 Combination Fire & Smoke Dampers are UL555 and UL555S tested and intended to protect HVAC penetrations made through fire and smoke rated walls and floors. These fire and leakage-rated dampers have been investigated for both a fire protection rating of 1-1/2-hour or 3-hour and a leakage rating as defined under Class I or Class II. Leakage ratings of combination fire & smoke dampers are determined at an elevated temperature of 250°F or 350°F. Leakage ratings of combination fire & smoke dampers are established based on test conditions using heated air.
The basic requirement for combination fire & smoke dampers is operation at minimum velocities of 2000 feet per minute at 4 in. w.g. of static pressure for the range of “3V” blade models and maximum velocities of 4000 feet per minute at 6 in. w.g. of static pressure for the range of “Airfoil” blade models when closed.
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