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Bifold Door Seal Replacement Maintaining the proper seal of bifold doors is vital to ensure the control of temperature, energy efficiency and the quality of the area. Like any other door system they may have issues. Over time, the gasket seal may flatten, become harder or brittle and lose its ability to stop drafts. This can be easily fixed by replacing the seal with this kit. Frame Bifold doors let in a lot of light and let in more light to an area. They can also be extremely useful if you need to