KSD-333 Class I - HVAC Industries

APPLICATION The Model KSD-333 is a UL555S Classified smoke damper designed for use in dynamic smoke management systems or other applications requiring ultra-low leakage performance.It provides operation and dynamic closure for vertical or horizontal mounting with airflow from either direction. Performance Ratings: Max Static Pressure: Up to 4” W.G (1000 Pa) Max Velocity: Up to 4000 FPM (20.3 m/s) Operating Temperature: Up to 350°F (177°C) This model is compatible with a wide range of HVAC air conditioners, offering reliable air distribution and control solutions for modern building systems. STANDARD CONSTRUCTION Frame: 16 gauge (1.6 mm) galvanized steel, interlocking hat-section channel frame construction. Blades: 16 gauge (1.6 mm) galvanized, 3 “V” formed. Bearings: Sintered bronze, oil-impregnated. Axles: 1/2" (12.7 mm) square zinc-plated steel studs. Linkage: 0.12" × 0.50" (3 × 12.7 mm) zinc-plated steel, concealed within the channel frame. Finish: Mill galvanized. Blade Seals: Silicone edge type for smoke seal up to 450°F (232°C). Jamb Seals: 300 series stainless steel, flexible metal compression type. Jack Shaft: 1/2" (12.7 mm) diameter zinc-plated steel with connector coupling. Actuator: Electric spring return (230 V, 120 V, or 24 V) and pneumatic options available. Caulking: UL-approved silicone sealants: Dow Corning RTV-732, Nuflex 302. Sleeves: Rectangular construction. SIZE RANGE Minimum Size (Single Section): 8" × 8" (203 × 203 mm) Maximum Size (Single Section): 36" × 36" (914 × 914 mm) FEATURES UL555S Classified Smoke Damper label for dynamic system use. Meets NFPA 90A, 92A & 92B criteria for smoke dampers. OPTIONS Bearings: Stainless steel. Actuator Mounting: External & internal. Optional Material: Stainless steel construction. Sleeves: Round, oval, and special configurations. NOTES Dampers are furnished approximately 1/4" (6 mm) smaller than given duct dimensions. Refer to the Installation Instruction and supplements for full installation details.