Intumescent Letterbox Assemblies 254mm. SSSIntumescent Letterbox Assemblies 30 min's Fire Protection. 254mm BS EN 1935. Smokeproof. Comes with a 10 year mechanical guarantee and is Fire door rated. A stylish ABS framed, adjustable telescopic sleeved letterbox, with metal flaps and fitted with a high performance intumescent liner. In the event of fire the intumescent liner expands rapidly and seals off the letterbox opening, preventing the spread of fire and smoke whilst maintaining the
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