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Bifold Door Seal Replacement Keeping bifold doors properly sealed is vital to maintain climate control, energy efficiency and the quality of the space. However, just like any other door, they could be subject to problems from time to time. The gasket seal's rubber material may become brittle, harden or become brittle over time, reducing the ability to stop draughts. This can be easily repaired by replacing the seal with this kit. Frame Bifold doors let in