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Bifold Door Seal Replacement Due to their compact design and easy access Bifold doors are a popular choice for hangars, garages, and other industrial spaces. It is important to keep them sealed to ensure energy efficiency, cleanliness, and a comfortable atmosphere. Over time gaskets flatten and shrink or are damaged, which can cause draughts, water ingress and heat loss. This is a simple and quick fix. Seals on the Top The seals on bifold doors made of rubber can flatten