Intumescent Fire Door Seal 2100mm - 30 Minute Fire Integr...Product Overview This premium intumescent fire door seal is a simple and effective solution, ideal for many internal fire doors. In the event of a fire, these intumescent strips expand, sealing the gap between the door and its frame, effectively blocking smoke and heat. This provides crucial protection against the spread of fire for its rated duration. Fire Integrity Rating Certified with a 30 minute integrity rating, this fire door seal is suitable