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Bifold Door Seal Replacement Maintaining the proper seal of bifold doors is vital to maintain climate control, energy efficiency and the overall quality of the space. However, as with any door, they are affected at times. The gasket seal's rubber material can flatten, harden or become brittle with time, decreasing its ability to stop draughts. This can be easily fixed using this seal replacement kit. Frame Bifold doors let in plenty of light and can open up a space. They also work well f