Rectangular Fire Dampers

Our rectangular fire dampers are steel curtain-type (folding blade) dampers, designed to stop the spread of fire through ducts, walls, floors and ceilings and maintain fire compartmentation. A pack of interlocking, ribbed steel blades is held folded open against constant-force springs by a fusible link rated at 72°C; in a fire the link melts and the springs drive the blade pack shut automatically. Operation is fully mechanical — there is no electric actuator to wire or maintain.

Each damper is made to order to your exact width × height in millimetre increments, from 100mm × 100mm up to a maximum single-section size of 1200mm wide × 1000mm high. Enter your dimensions on the product page and the price calculates instantly online — no waiting for a quote. Support cleats are available as an optional extra.

Certified Fire Performance

• Fire classification E120 to BS EN 1366-2, classified to BS EN 13501-3 (all tested installation methods)
• Manufactured to the fire damper product standard BS EN 15650
• Blade leakage Class 2 to BS EN 1751; corrosion tested to ASTM B117
• Tested installation methods for masonry/blockwork walls, dry partition walls and concrete floors, suitable for vertical and horizontal installation

Frame and Material Options

Choose an Angle Frame (AF) or HEVAC frame installation method, in galvanised steel or 430-grade stainless steel — four variants, all sharing the same made-to-measure sizing. The fully welded case uses galvanised mild steel to BS EN 10346 (DX51D + Z275) as standard.

Need smoke control or alarm-signal closure as well? See our motorised fire & smoke dampers. For circular ductwork, our FD-C circular fire dampers cover 100–315mm diameters. Made-to-order lead times are shown on each product page, and UK mainland delivery is free over £400 ex VAT.