Smoke and fire can escape through a standard letterbox. This is extremely dangerous in multiple occupancy residential buildings, where it could spread to communal hallways. An intumescent letterbox can be fitted in a fire door without compromising the integrity of its assembly. During a fire, intumescent letterbox lining expands and seals, protecting shared areas that may be used for evacuation by stopping the spread of smoke and fire.
Need an intumescent letterbox? Browse FireSealsDirect’s wide selection today.