Intumescent Seals

Intumescent Seals for Fire Doors

Fire door seal missing or damaged? Intumescent seals swell up when heated, closing the gap round a fire door to help hold back fire and smoke.

We stock the Exitex intumescent strip (5.2m) and a fire and smoke self adhesive door seal.

Before You Order

Fire door specification

Intumescent seals are part of a fire door's tested design. Check the door maker's instructions for the seal type and size.

Fire only or fire and smoke

Some seals are for fire only. Fire and smoke seals have a brush or fin to help stop cold smoke.

Length

Measure round the door or frame. Check the strip length on the listing.

Width

Match the width of the groove or the original seal.

Intumescent Seal Guide

How Intumescent Seals Work

Under normal conditions they look like a plain strip. In a fire, the heat makes the material expand and fill the gap between the door and the frame.

Fire Safety

Fire doors protect lives. If you are unsure which seal your fire door needs, check with the door manufacturer or a fire safety professional.

Frequently Asked Questions

Can I fit an intumescent seal to any door?

Fitting a seal does not make an ordinary door a fire door. Seals must suit a certified fire door.

Where do intumescent seals go?

Usually in a groove in the door edge or the frame. Follow the door maker's instructions.

Browse all gaskets and seals: bubble, flipper, E gasket, wedge, Q-Lon, Aquamac, U-channel, threshold seals and draught excluders.

Not sure which intumescent seal you need? Send us a photo of your door edge and the old seal, and we'll help.

Send us a photo to identify your part

Monday to Friday, 8:30–12:30 and 13:00–15:30