Intumescent Letter Flap Kit System
An intumescent fire and smoke protection letter flap system. Consists of a frame with smoke protection seal, a spring-loaded flap and an intumescent liner to fix into the door aperture. Some options also feature a security hood with a brush seal to stop people putting their hands through the letter box.
Intumescent letter boxes are mainly used on the doors of flats. This prevents any potential fire from inside spreading into hallways or escape routes.
These products have been included in a fire test employing the general procedures and criteria pf BS476 Part 22. Built into a composite door, the integrity will be maintained for 61 minutes. Also test to EU standard EN1634-1, achieving 68 minutes.
Colour: Brown, White, Stainless Steel, Brass.
Option A: Front smoke frame and flap + intumescent liner.
Option B: Front smoke frame and flap + intumescent liner + rear smoke frame and flap.
Option C: Front smoke frame and flap + intumescent liner + security hood (black).
Aperture Size L1-L4: 50mm x 267mm (hole size). 75mm x 315mm (overall size). Standard Size.
Aperture Size L6-L8: 69 x 290mm (hole size). 100mm x 335mm (overall size). Large Package Size.