Air Control Products: HHE/BFD
AirVent family →The butterfly collar damper is shut-off at its simplest: one disc on a shaft inside the duct collar, swung by hand between open and closed. For round branch ducts and spigots that need isolation or coarse setting rather than fine modulation, it is the economical answer.
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When ducts grow large, round and hot: beyond roughly a metre, or in high-temperature and abrasive service, a single reinforced disc on a heavy shaft outperforms multi-blade assemblies on cost, sealing and survival.
By lever for small sizes, quarter-turn gear operators for mid-range, and actuators, electric or pneumatic, for automated and modulating duty. Position indication and limit switches are standard options.
More from Dampers
Manual or motorized multi-blade dampers for balancing air volume across supply and return mains: the tap of the duct system.
Aerofoil-blade VCDs: shaped blades that throttle high-airflow mains with less noise and turbulence than flat blades.
Round VCDs: single-blade volume control for round ducts, spigots and branch take-offs.
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