About Intumescents & Fire Seals
What is Intumescent Fire and Smoke seal?
To protect a building from risk, fire resisting doors and walls must provide a complete barrier against the flames and, where required, smoke. Therefore, fire doors must fit tightly against the frame but still open and close correctly under normal use. The Building Regulations provide a maximum gap that is allowed around the door and requires thermally activated intumescent seals to be fitted. When exposed to heat, these seals expand to fill the gap around the door and resist the movement of smoke and fire. In certain areas of the building, such as protected sections and stairwells, the doors also must have smoke seals. These are either solid ‘flippers’ or brushes designed to stop the smoke moving past the door. There are a range of options available including seals that include both a smoke seal and an intumescent element. For example, the Sealmaster Intumescent Seals, that feature a flipper smoke seal and intumescent element, or the Pyroplex Fire & Smoke Intumescent Strip that has a brush pile to stop the passage of smoke. Furthermore, intumescent seals should also be fitted under CE marked fire door hinge leaves, to comply with the marking requirements. These pads should be fitted to the door and frame under each hinge leaf. The thickness of the required seal will depend on whether is a 30- or 60-minute fire door. With our Intumescent Pad packs, you simply install one pad under each leaf for FD30 doors and two for FD60 doors.
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