4FireDoors Fire Rated Letterbox 270 x 70mm

An ABS framed, telescopic letterbox with a satin anodised aluminium flap, suitable for use with FD30 fire doors. In the event of a fire the intumescent liner expands rapidly sealing off the letterbox opening, preventing the spread of fire and smoke. Suitable for use on FD30 fire doors The internal brushes provide draught exclusion assisting with energy costs The telescopic sleeve allows fitment on doors from 40-80mm thick There is a weather seal on the external side of the letterplate The letterplate flap opens to 170°