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Bifold Door Seal Replacement Making sure that bifold doors are properly sealed is essential to maintaining the control of temperature, energy efficiency and the quality of the space. However, as with any door, they are susceptible to issues from time to time. The rubber gasket seal can flatten, harden or become brittle over time, reducing the ability to stop draughts. This is easily remedied with this seal kit replacement. Frame Bifold doors are ideal to let in lots of natural light an