Envirograf Letterbox Unit with Front Flap and Intumescent Liner - Kit A for up to 60 minutes integrity
KIT A - Front smoke frame and flap + intumescent liner.
Sizes - to fit apertures
- 50mm x 267mm - overall size 75mm x 315mm
- 69mm x 290mm - overall size 100mm x 335mm
This product has been included in a fire test employing the general procedures and criteria of BS476 Part 22 1987, built into a composite door, maintaining the integrity of the door for 61 minutes.
Also tested to European Standard EN1634-1 (2000), achieving 68 minutes integrity
About Kit A - Letterbox unit with front flap and intumescent liner
An intumescent fire and smoke protection letter flap system comprising a frame fitted with smoke protection seal and a spring loaded flap, which can be used on either side of a door, and an intumescent liner to fix into the door aperture, only 3.5mm thick.
Intumescent letter boxes are mainly used on door of flats, so that if there was a fire in the flat, the fire wouldn't break through to the outside escape route.
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