£39.60 (incl VAT)
Envirograf Letterbox Unit with Internal Spring Loaded Flap - Kit B for up to 60 minutes integrity
KIT B - Front smoke frame and flap + intumescent liner + rear smoke frame and flap.
Intumescent letterbox units with options including a security hood with brush seal. Lockable letter plates sold separately.
Intumescent letter boxes are mainly used on door of flats, so that if there was a fire in the flat the fire would not break through to the escape route.
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
Envirograf Product 49
£59.39 (incl VAT)
About Intumescent Letterbox Unit
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.
- Kit A - Front frame, flap and intumescent liner
- Kit B - Front frame, flap and intumescent liner, plus rear frame and flap
- Kit C - Front frame flap and intumescent liner, plus rear security hood
Available colours:
- white,
- brown,
- brass,
- stainless steel
Available in two unit sizes:
- Hole size 50 x 267mm, Overall size 75 x 315mm
- Hole size 69 x 290mm, Overall size 100 x 335mm
Intumescent letter boxes are mainly used on door of flats, so that if there was a fire in the flat the fire would not break through to the escape route.
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