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Bifold Door Seal Replacement Due to their space-saving design and ease of access, bifold doors are popular for hangars, garages, and other industrial spaces. Making sure they are sealed properly is essential for energy efficiency and cleanliness, as well as a comfortable indoor space. As time passes, gaskets become flat and shrink, or become damaged, which can cause leaks, draughts, and loss of heat. This is a simple and quick fix. Seals on the top Rubber seals on bifold doors