Intumescent Strips. Fire, smoke, and acoustic protection for timber, metal and composite doors. Fire doors are a crucial component in the passive fire protection of a building, and all fire doors must be fitted with the appropriate seals. The fire door strips are placed between the door frame and the door on all four sides.. 15 x 4mm Fire only intumescent strip 2.1m Black. Inc.VAT £3.02. Excl.VAT: £ 2.52. (FO1504/BK) 1084 IN STOCK. Buy Now. Intumescent strips are important as they help to contain the fire in one compartment and prevent it from spreading to another. When in contact with heat they expand, sealing the gaps around a fire door.

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3M™ Expantrol Flexible Intumescent Strip E-FIS is an intumescent tape designed to seal the air spaces between doors, frames and glass to help prevent the spread of fire, smoke, toxic gases and other byproducts from penetrating into adjacent areas. Intumescent material expands and forms a hard char when exposed to heat. This flexible, conformable strip can be quickly cut to required sizes.. Intumescent strips, or fire seals, are fitted to the two sides and top of a fire door. When exposed to extreme heat, they expand to close any gaps or edges t.