• 272 x 70 External Size Designed with external dimensions of 272mm x 70mm for installation on various fire door types.

• 30 Minute Fire Rated Barrier Fire tested to BS EN 1634-1 and BS 476 part 22, maintaining door integrity for 30 minutes.

• Adjustable Telescopic Fit Features a telescopic sleeve to fit door thicknesses ranging from 40mm up to 80mm easily.

• 32dB Sound Proofing Acoustic tested to BS EN ISO 140-3: 1995, offering effective 32dB Rw sound insulation.

• Smoke Tight & Security Tested Smoke tested (BS 476) and Security tested (BS EN 13724), with a sealed backplate and draught excluders.

Description

This Intumescent Letterbox provides crucial fire safety, acoustic damping, and security features for door installations. The external size is 272mm x 70mm, finished in Satin Anodised Aluminium with a Silver Frame for a modern aesthetic. It is fire tested to BS EN 1634-1 and BS 476 part 22, ensuring it provides a reliable 30-minute fire rating. The core features a rapid-expanding intumescent liner that seals the opening in a fire event, preventing the spread of smoke and flames. The unit is built with an adjustable telescopic sleeve designed to fit door thicknesses from 40mm to 80mm. It also features a fully sealed backplate, fitted brush pile draught excluders, and integral sound dampening bumpers, contributing to its 32dB Rw Acoustic Rating. The letterbox has been security tested to BS EN 13724 standards.