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Bifold Door Seal Replacement Bifold doors are a popular option for garages, hangars and various industrial spaces due to their efficient use of space and quick access. Maintaining them properly sealed is vital for energy efficiency and cleanliness, as well as a comfortable indoor space. Gaskets can become flat, shrink, or become damaged over time. This leads to water ingress and draughts, as well as loss of heat. Fortunately, fixing this is simple and quick. Seals on Top Over time the seals made of rubber