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Bifold Door Seal Replacement It is important to maintain the control of temperature as well as the energy efficiency and the overall quality of the room by ensuring that bifold doors are sealed properly. Like any other door system, they can have problems. The gasket seal's rubber material may become brittle, harden or become brittle after a certain period of time, decreasing its ability to stop draughts. This can be easily fixed using this seal replacement kit. Frame Bifold doors let in lots of light and