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Bifold Door Seal Replacement Bifold doors are a popular choice for garages, hangars and other industrial spaces because of their efficiency in utilizing space and quick access. Keeping them sealed properly is crucial for energy efficiency and hygiene, as well as a pleasant indoor space. Gaskets can flatten, shrink or even break over time. This can cause draughts and water ingress, as well as loss of heat. is a simple and quick fix. Seals on the top The seals on bifold doors made of rubber can become flat