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Bifold Door Seal Replacement Bifold doors are a favorite option for garages, hangars and other industrial spaces because of their efficient use of space and easy access. It is important to keep them sealed to ensure energy efficiency, cleanliness, and a comfortable environment. Gaskets can flatten, shrink, or become damaged over time. This causes water ingress and draughts as well as heat loss. This is a simple and quick fix. Seals on the Top Over time the seals made of rubber on a bifold will