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Bifold Door Seal Replacement Keeping bifold doors properly sealed is vital to maintain the control of temperature, energy efficiency and the quality of the area. However, as with any door, they are affected at times. The gasket seal made of rubber can become hard, flatten or become brittle over time, decreasing its ability to stop draughts. This can be easily fixed with this seal replacement kit. Frame Bifold doors let in lots of light and can open up the space. They're also great for mov