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Bifold Door Seal Replacement It is important to maintain the control of temperature, energy efficiency, and overall quality of the space by keeping bifold doors sealed properly. As with any door system they may have issues. The gasket seal's rubber material can flatten, harden or become brittle over time, reducing the ability to stop draughts. This can be easily fixed with this seal replacement kit. Frame Bifold doors let in lots of light and can open up a space.