Intumescent fire and smoke seals are for fitting into a rebate on the fire door or frame so that, when subject to heat, it expands to many times its size and fill the gaps with a flame-tight seal for 60 minutes, depending on size. These are essential for fire doors to fully block the area between the door and frame to enable a fire to be contained to the room it originates in order prevent fire and smoke spreading, reducing risk to lives and limiting damage. Commonly found in offices, rental properties, schools, and all other buildings open to the public, ensure you know which fire rating you require.