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Bifold Door Seal Replacement Keeping bifold doors properly sealed is vital to maintain energy efficiency, climate control and the quality of the space. As with any door system, they can have problems. The rubber gasket seal may become brittle, harden or become brittle over time, decreasing its ability to stop draughts. This can be easily fixed with this seal replacement kit. Frame Bifold doors are great for letting in plenty of natural light and making a room appear larger. They can al