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Bifold Door Seal Replacement Maintaining the proper seal of bifold doors is vital to maintain energy efficiency, climate control and the quality of the area. Like all door systems they are susceptible to issues. The gasket seal's rubber material can flatten, harden or become brittle with time, which reduces the ability to stop draughts. This can be easily corrected with this seal kit replacement. Frame Bifold doors let in plenty of light and can open up an area. They're also great to move furniture or add additional seating or cook