Greenheck OFSD Series Out of Wall Combination Fire Smoke Damper

The Greenheck OFSD Series is an out-of-wall combination fire and smoke damper engineered to restrict the spread of fire and smoke through HVAC ductwork where the damper is mounted outside the rated wall assembly. Available in OFSD-211 and OFSD-311 configurations for applications where in-wall installation is not feasible.

Designed to meet UL 555 and UL 555S requirements, the OFSD Series provides both fire-rated closure and smoke control in a single unit. A robust actuator and blade assembly closes automatically upon detection of fire or smoke, offering flexible installation options while maintaining life-safety performance in commercial and institutional HVAC systems.

Ideal for commercial, institutional, and industrial buildings requiring UL-listed out-of-wall combination fire and smoke damper protection where standard in-wall installation is not possible.