Fire Door Strips & Seals

Intumescent strips swell in the heat to close the gap around a fire door, while smoke seals block cold smoke on an escape route. Combined strips do both in one fitting.

Product Black Aquamac 21 Q-Lon foam door seal on a 5.5m reel

Aquamac 21 Door Seal

£11.85 (inc VAT)

The Seals That Close the Gap in a Fire

Every fire door needs a way to seal the gap around its edge when a fire takes hold, and that job falls to the strips and seals fitted into the door or frame. Intumescent strips sit in a groove around the door edge and swell in the heat, closing the gap so flames and hot gases cannot pass. Smoke seals, often a brush or fin, block cold smoke at everyday temperatures, which is what protects an escape route early in a fire.

They are part of what turns a door into a working fire doorset, alongside fire-rated hinges and other fire door accessories, and they fit the full range of internal fire doors.

Intumescent strips, smoke seals and combined

There are three common types. Plain intumescent strips handle fire only. Combined strips add a brush or fin seal to the same fitting, so one product does both fire and smoke, and these are what most modern fire doors use. Separate smoke seals and threshold or drop-down seals cover specific gaps at the bottom of the door. Match the strip size and rating to the door.

Getting the fit right

Strips and seals only work if they match the door and are fitted correctly, usually into a groove in the door edge or frame, unbroken all the way round. They pair with the FD30 or FD60 door and its fire-rated frame or lining. Follow the door's certification for the strip type and size it needs.

FAQs

They sit in a groove around the door edge and expand when they get hot, sealing the gap between door and frame so flames and hot gases cannot pass. They do nothing at room temperature; they only activate in a fire.

An intumescent strip seals against fire by expanding in heat. A smoke seal, usually a brush or fin, blocks cold smoke at normal temperatures. Combined strips carry both in one fitting, which is what most modern fire doors use.

To perform as a certified doorset a fire door needs the intumescent protection its test specifies, and smoke seals where an escape route needs cold-smoke control. The door's certification states what it requires.

Intumescent strips are fitted into a groove in the door edge or frame, so retrofitting means routing that groove correctly and matching the strip to a genuine fire door. They cannot turn an ordinary door into a fire door.