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Bifold Door Seal Replacement Bifold doors are a popular choice for hangars, garages and various industrial spaces because of their efficiency in utilizing space and swift access. It is essential to keep them sealed for the sake of energy efficiency, cleanliness and a comfortable space. Gaskets can flatten, shrink, or become damaged over time. This can cause water ingress and draughts as well as heat loss. Thankfully, fixing this is easy and quick. Seals on the Top Rubber seal