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Bifold Door Seal Replacement Keeping bifold doors properly sealed is vital to maintain energy efficiency, climate control and the overall quality of the space. However, as with any door, they are subject to problems at times. The gasket seal's rubber material can flatten, harden or become brittle over time, which reduces the ability to stop draughts. This is easily remedied with this replacement seal kit. Frame Bifold doors let in lots of light and can open up a space. They can also be extremely practical if you