Alpine Ventilation has a range of inline butterfly dampers to prevent backdrafts in ducting. They are constructed with galvanised steel, with 2 spring loaded aluminium dampers and a foam ring for quiet operation. The damper goes inside ducting and secures with worm clamps and/or duct tape.
The 4 sizes available are 100mm (BD100), 125m (BD125), 150mm (BD150) and 200mm (BD200). This butterfly damper features a durable construction using premium materials, ensuring long-lasting performance and resistance to corrosion. It is designed to fit snugly within ducts, effectively blocking reverse airflow and preventing drafts from entering or escaping through the ventilation system.
0.4mm galvanised steel construction
Approx 147mm diameter to fit inside 150mm internal diameter ducting
Spring loaded 0.1mm aluminium dampers
Foam ring for seal and quiet operation
Compatible with flexible foil or semi-rigid ducting
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What you need to know before purchasing
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