Intumescent Letter Box Liner (Product 50 ) Fire Door Upgrades recommended for Class A (combustible

recommended for Class A (combustible materials)

Classes 0 & 1 (Spread of Flame)

Then adhered to the surface of metal windows via the self-adhesive backing

CB300                                                   300mm

so that the sponge / polyurethane absorbs the 321

Intumescent Letter Box Liner (Product 50 ) Fire Door Upgrades recommended for Class A (combustibleIntumescent liners for improving the fire rating of existing letter box apertures. An intumescent liner for letter box. This product comprises of two adhesive L shaped sections with self adhesive backing for fixing. For mail apertures in fire doors where letter flaps already exist. Aperture sizes up to the limit for each type (LBL1 and LBL2) adjust the liners by cutting with a sharp knife as required. Seal any bare wood apertures with paint or wood