Systemair BTG 640 Back Draft Damper - for air handling units

Back draft damper designed for the TG 300-800, TG 400-500, TG 400-800 and TG roof curbs, which can be fitted as long as the roof curb is installed vertically. The frame and damper vanes are manufactured from galvanised sheet steel. The frame is screwed or riveted on to the roof curb’s perforated inner casing.