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Bifold Door Seal Replacement It is crucial to keep the control of temperature, energy efficiency, and overall quality of the space by ensuring that bifold doors are sealed properly. However, as with any door system they can be subject to problems from time to time. The gasket seal's rubber material can flatten, harden or become brittle over time, decreasing its ability to stop draughts. This is easily remedied with this seal kit replacement. Frame Bifold doors are ideal for letting in lots of light and op