Intumescent Letter Box Liner

This intumescent letter box liner is designed to provide effective fire and smoke protection through external mail apertures in doors.

The liner consists of two self-adhesive, L-shaped intumescent sections that are installed directly into an existing letter box opening.

In the event of a fire, the intumescent material expands to seal the aperture, helping to restrict the spread of fire and smoke through the door.

The liner is quick and simple to install with no specialist tools required, making it suitable for both new installations and retrofit applications.

Available sizes:
Small: 39 mm x 254 mm
Large: 65 mm x 290 mm

• Provides passive fire and smoke protection through letter box openings

• Expands when exposed to heat to seal the mail aperture

• Supplied as two self-adhesive L-shaped intumescent sections

• Designed for quick retrofit into existing letter boxes

• Suitable for use on fire doors where letter plates are fitted

• No specialist tools required for installation

• Available in two sizes to suit common letter box openings (small: 39 mm x 254 mm & large: 65 mm x 290 mm)