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Bifold Door Seal Replacement Making sure that bifold doors are properly sealed is vital to maintain the control of temperature, energy efficiency and the quality of the space. However, as with any door, they are affected from time to time. The gasket seal's rubber material may become brittle, harden or become brittle over time, decreasing its ability to stop draughts. This is easily fixed using this seal kit replacement. Frame Bifold doors are fantastic for letting in lots of natu