Do I Need To Fit Seals On My Fire Door

- May 08, 2019-

They are designed to expand under heat, and fill the gaps between the door leaf and frame, thereby preventing the passage of smoke and fire to other parts or compartments of the building. Acoustic seals may also be required which have an additional role of preventing the passage of sound.

Intumescent seals may be placed into grooves machined in the two vertical sections and top edge of the door frame. When exposed to heat, intumescent seals expand to many times their original size, sealing the gap between the door and the frame and aiding containment of the fire.

The materials contained in the seals, (such as sodium silicate or graphite), differ between seal manufacturers, and expand at different rates. It’s important to use the same type of seals around the door, when installing or replacing seals.