A Stylish Abs Framed Telescopic 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 Integrity Of The Fire Door Assembly.Letterbox Flap Opens To 180° AngleSmoke Tested To Bs 476 Part 31/1: 1983Fire Tested To Bs 476 Part 22: 1987 & Bs En 1634-1Acoustic Tested To Bs En Iso 140-3: 1995 Achieving 32Db RwSecurity Tested To Bs En 13724 Clause 6.6.5 (Compliant Within Scope Of Pas 23/24)Adjustable Telescopic Sleeve To Suit 40Mm - 80Mm Door ThicknessPTDTIM487457
