Carlisle Brass Intumescent Letterbox Assemblies 254mm CP Durham Improves acoustic and draught proofing

Improves acoustic and draught proofing performance

into one another

we recommend using either Weathered Antique Bronze or Matt Antique Brass

Available in key profile only - for external doors

Carlisle Brass Intumescent Letterbox Assemblies 254mm CP Durham Improves acoustic and draught proofingIntumescent 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