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Bifold Door Seal Replacement It is essential to ensure the control of temperature as well as the energy efficiency and quality of the room by keeping bifold doors sealed correctly. As with any door system, they can have problems. Over time, the gasket seal could become flattened, become harder or brittle, and reduce its ability to impede drafts. This can be easily repaired using this seal replacement kit. Frame Bifold doors are fantastic for letting in lots of natural light while creating a sp