KSD-333 Class III UL555S Smoke Damper for HVAC

The KSD-333 Class III smoke damper is engineered for high-performance dynamic smoke management systems. Classified under UL555S, this damper ensures reliable closure and air control in critical HVAC installations, meeting the rigorous criteria of NFPA 90A, 92A, and 92B. It is designed for both vertical and horizontal mounting, accommodating airflow from either direction to provide versatile integration into modern building infrastructure.

Key Features & Specifications

• Performance: Handles static pressures up to 4" W.G. (1000 Pa) and velocities up to 4000 FPM (20.3 m/s).
• Temperature Resistance: Operating up to 350°F (177°C) with blade seals rated up to 450°F (232°C).
• Construction: Robust 16-gauge galvanized steel hat-section frame with interlocking design for structural integrity.
• Blades & Seals: 16-gauge galvanized V-formed blades with silicone edge seals for superior smoke tightness.
• Hardware: Sintered bronze bearings and 1/2" zinc-plated square steel axles for smooth operation.
• Actuation: Compatible with electric spring-return (24V, 120V, 230V) and pneumatic actuators.

Ideal for commercial and industrial facilities requiring certified smoke control solutions, the KSD-333 offers durable construction and precise air distribution. The concealed linkage system within the channel frame ensures a clean aesthetic and protected mechanical components, while the mill galvanized finish provides corrosion resistance in standard environments.