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Intumescent Letterbox

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.

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