KSD-333 Class II UL555S Smoke Damper
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Product description
The KSD-333 is a high-performance Class II smoke damper engineered for dynamic smoke management systems and other applications demanding ultra-low leakage rates. It ensures reliable operation and dynamic closure for both vertical and horizontal installations, accommodating airflow from either direction. This unit is essential for maintaining fire safety integrity in modern commercial and industrial buildings.
Key Specifications & Performance
- Classification: UL555S Classified Smoke Damper.
- Static Pressure: Up to 4” W.G (1000 Pa).
- Air Velocity: Up to 4000 FPM (20.3 m/s).
- Operating Temperature: Up to 350°F (177°C).
- Sealing Temperature: Silicone edge seals rated up to 450°F (232°C).
Robust Construction
Built for durability and precision, the KSD-333 features a 16-gauge (1.6 mm) galvanized steel interlocking hat-section channel frame. The blades are 16-gauge galvanized steel with a 3” V-form design, mounted on sintered bronze oil-impregnated bearings. The linkage is concealed within the channel frame for a streamlined profile, and the finish is mill galvanized to resist corrosion.
Applications & Standards
Compliant with NFPA 90A, 92A, and 92B criteria, this damper is suitable for HVAC air conditioners and air distribution systems. It is available in single-section sizes ranging from 8” x 8” (203 x 203 mm) to 36” x 36” (914 x 914 mm). Options include stainless steel construction, external or internal actuator mounting, and various sleeve configurations (rectangular, round, or oval).
