This Asec Surface Fit Fire & Smoke Intumescent Door Kit helps to protect the integrity of doors and prevent the spread of fire and smoke, making it an ideal investment when fireproofing properties. With an integrated smoke seal, the kit is made from a self adhesive intumescent sheet which, when heated, expands to many times its original volume, sealing the gap around the door to help provide an effective barrier against the passage of fire and smoke. The kit has been fire tested for up to 1 hour and is Certifire approved. Kit Contains: 3 lengths of 1.65mm thickness x 1050mm lengths 2 lengths of 1.05mm thickness x 1050mm lengths