Intumescent Letterbox

Fireproof letterboxes or intumescent letterboxes are designed to stop the spread of fire and smoke. In the event of a fire, the intumescent liner inside the fireproof letterbox expands to seal the letter plate opening. These fireproof letterboxes prevent fire from spreading further through residential buildings for a given amount of time, which allows shared areas to be evacuated safely.

Our fire-rated letterboxes meet the most stringent regulatory requirements, including the British Standard 476 fire tests. The Lorient Firemaster Letterplate is one of the first-ever Certifire-approved letterboxes on the market.

We stock a wide variety of intumescent letterboxes, available in a range of colours, sizes and finishes, ensuring a suitable option for every type of fire door. The ergonomic design of each fireproof letterbox ensures that they function as well as a standard letterbox while also maintaining the integrity of the fire door assembly.

Browse FireSealsDirect’s wide selection of intumescent letterboxes today, with fireproof letterboxes available in different sizes and finishes.

Learn more about intumescent letterboxes, including what they are, when you might need one as well as how to correctly fit an intumescent letterbox to your door.

Visit our Advice Centre for the latest regulations, specifications and fire-stopping news updates. If you have further questions, give our Technical Helpline a call for free, impartial advice.