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Firetherm Intuvent is designed to provide up to 60 minutes fire resistance to ventilation openings in fire doors and openings if fire compartment walls and floors required for air transfer. Intuvents can also be used as an Intumescent fire damper in ventilation ducts. They have a free area of approximately 80% and can be produced in sizes up to 1m x 1m, at 44mm thickness. An anti-vermin mesh is standard. Tested to: British Standards 476 Pt 20 |