Koolair intumescent grilles, model V for rectangular ducts and model VC for round ducts, are used to compartmentalise zones in the event of a fire or high temperature gases.
The V and VC grilles contain an intumescent material that expands when exposed to heat (usually within 5 minutes) to seal the ventilation duct and prevent flames, smoke or gases from getting through. They comply with European Test Standard EN1364-5.
They are available in a wide range of sizes and thicknesses.
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