Back-Draught Shutter (BDS)
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The Back-Draught Shutter (BDS) is a mechanical device installed in ductwork to prevent reverse airflow when a fan or ventilation system is not operating. It automatically closes when air pressure drops, stopping unwanted drafts, heat loss, or ingress of dust and contaminants. Back-draught shutters are commonly used in HVAC supply, extract, and exhaust systems for commercial, industrial, and residential applications.
Material:
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Casing: Galvanised steel or stainless steel for durability and corrosion resistance
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Blades: Aluminium or steel, lightweight for smooth operation
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Hinges/Shafts: Stainless steel or zinc-plated steel for long-lasting movement
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Seals (optional): Rubber or silicone to minimise leakage
Specifications:
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Type: Gravity-operated or spring-assisted back-draught shutter
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Sizes: Available in circular and rectangular ducts, custom sizes as required
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Pressure Rating: Suitable for low to medium pressure duct systems
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Mounting: Inline duct installation, wall, or roof openings
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Blade Operation: Opens under positive airflow and closes automatically under reverse flow
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Finish: Galvanised steel standard; powder coating or stainless steel optional
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Applications: Supply, extract, and exhaust air systems in HVAC installations
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Optional Features: Motorised actuation, locking mechanism, and weatherproof option