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Bifold Door Seal Replacement Bifold doors are a popular choice for hangars, garages and other industrial spaces because of their efficient use of space and quick access. It is important to keep them sealed to ensure energy efficiency, cleanliness and a comfortable atmosphere. As time passes, gaskets begin to flatten and shrink or are damaged, leading to water ingress, draughts and loss of heat. This is a simple and quick fix. Seals on the Top Bifold doors with rubber seals can flatten out or become damaged over ti