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Bifold Door Seal Replacement It is essential to ensure the temperature control as well as the energy efficiency and the overall quality of the room by sealing bifold doors correctly. But, like any door, they could be affected from time to time. Over time, the gasket seal may flatten, become harder or brittle and lose its ability to stop drafts. This is easily remedied with this replacement seal kit. Frame Bifold doors are ideal for letting in plenty of natural light and creating a spacious space.