Combination Fire and Smoke Damper
Model 771UL 555 & UL 555S Classified Dampers with Static/Dynamic Closure. Leakage Class I @350 F with velocity 2000 FPM & Pressure 4” W.G. Model 771 & 771-3 is UL Rated with Fire Rating of 1.5 Hours & 3 Hours. Available with Test & Reset Switch. Approved by Qatar Civil defense.