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Bifold Door Seal Replacement It is important to maintain the climate control, energy efficiency, and the overall quality of the room by sealing bifold doors properly. However, as with any door, they are subject to problems from time to time. The rubber gasket seal may become brittle, harden or become brittle with time, reducing the ability to stop draughts. This can be easily corrected with this replacement seal kit. Frame Bifold doors are fantastic for letting in plenty of ligh