Letterbox Covers - White, With Cover

PVC Letter Box Brush Cover- White with Flap A simple letterbox cover, stops draughts and helps prevent hook grab crime. Specification - • Black Brush • Pre drilled screw holes with screws included • Full fitting instructions included • Simple to fit •Covers apertures upto 267mm x 76mm Advantages of Draught Proofing - Your house or commercial property will lose heat during cold weather partly due to poor thermal insulation, but also due to air infiltration or the permeability of the building. Infiltration or permeability is measured in meters cubed per hour per square meter of floor area. A typical building built 1900 to 1990 will lose around 15-25 meter cubed of air per hour per square meter of floor area. This is due to natural leakage through the fabric of the building, but largely through gaps around windows and doors. Good use of draft proofing could reduce your air permeability to around 10-15 meters cubed per hour which is a good low cost way of reducing your heating bills. In