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Bifold Door Seal Replacement It is crucial to keep the control of temperature, energy efficiency, and overall quality of the space by sealing bifold doors correctly. But, like any door system they can be affected at times. Over time, the rubber gasket seal could become flattened and become brittle or harder, and reduce its ability to block drafts. This can be easily corrected with this replacement seal kit. Frame Bifold doors let in plenty of light and can open up a space