Intumescent letter plates are designed to stop the spread of fire and smoke, unlike conventional letterboxes. In the event of a fire, the intumescent liner inside the letterbox expands to seal the letter plate opening and prevent fire from spreading through residential buildings. This allows shared areas to be evacuated safely.
Our range of intumescent letterboxes meet the most stringent regulatory requirements, including the British Standard 476 fire tests. Their ergonomic design ensures that they function as well as a standard letterbox while also maintaining the integrity of the fire door assembly. We stock a wide variety of colours, sizes and finishes, providing a suitable option for every type of fire door.
Browse FireSealsDirect’s wide selection today. Visit our advice centre for the latest updates on regulations, specifications and fire stopping news, or give our Technical Helpline a call for free, impartial advice.