
Category
The valves and guardians of the system: volume control and aerofoil dampers, fire, smoke, non-return and pressure relief dampers, and collar dampers at every branch, safety-critical hardware built to stay true years after commissioning.

Manual or motorized multi-blade dampers for balancing air volume across supply and return mains: the tap of the duct system.
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Aerofoil-blade VCDs: shaped blades that throttle high-airflow mains with less noise and turbulence than flat blades.
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Round VCDs: single-blade volume control for round ducts, spigots and branch take-offs.
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Weight-balanced dampers that automatically vent excess pressure: holding cleanroom and stairwell pressurization on target.
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Gravity-operated backdraft dampers that shut when the fan stops: no springs, no power, no backflow.
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Opposed-blade collar dampers: balancing built into the duct collar, adjusting each branch at its connection.
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Butterfly collar dampers: a single disc in the collar for simple, economical shut-off of round branch ducts.
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Fire-rated isolation dampers (1.5 and 3 hour ratings) that stop ducts carrying flame between fire compartments.
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Combined fire and smoke dampers: rated against flame and fitted with smoke detection and BMS signalling for life-safety zones.
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