Intumescent Strip Fire Seal 2.1m White is designed for using with a fire door. It is an intumescent graphite based fire seal contained within a PVC sleeve for fitting into a rebate to either the leaves or the frame of a door. In the event of a fire the seal expands to many times its original volume to close the gap around the door and prevent the passage of fire. It provides a safe and effective barrier for using where no smoke sealing is required.