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Bifold Door Seal Replacement It is important to maintain the control of temperature as well as the energy efficiency and quality of the room by ensuring that bifold doors are sealed correctly. However, just like any other door system they can be subject to problems at times. The gasket seal's rubber material can flatten, harden or become brittle over time, which reduces the ability to stop draughts. This can be easily corrected by replacing the seal with this kit. let in lots of light and let in more