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Bifold Door Seal Replacement Due to their space-saving design and easy access, bifold doors are popular for garages, hangars and other industrial spaces. It is important to keep them sealed to ensure energy efficiency, cleanliness and a relaxing atmosphere. Gaskets can flatten, shrink or even break over time. This can cause water ingress and draughts as well as heat loss. This is a quick and simple fix. Seals on Top Bifold doors with rubber seals can