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Bifold Door Seal Replacement Due to their compact design and easy access, bifold doors are popular for hangars, garages and other industrial spaces. It is crucial to keep them sealed to ensure the sake of energy efficiency, cleanliness and a pleasant atmosphere. As time passes, gaskets become flat and shrink or are damaged and this leads to water ingress, draughts and heat loss. This is a quick and simple fix. Seals on the Top The seals on bifold doors made of rubber can become flat o