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Bifold Door Seal Replacement Making sure that bifold doors are properly sealed is vital to maintain the control of temperature, energy efficiency and the quality of the space. But, like any door, they could be susceptible to issues at times. Over time, the gasket seal can become flat or become brittle, harder and less able to block drafts. This is easily remedied with this seal kit replacement. Frame Bifold doors let in lots of light and open up a space. They are also practic