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Bifold Door Seal Replacement Due to their compact design and ease of access, bifold doors are popular for hangars, garages and other industrial spaces. It is important to keep them sealed to ensure energy efficiency, cleanliness and a comfortable atmosphere. Gaskets can flatten, shrink or break down over time. This causes draughts and water ingress, and heat loss. This is a quick and simple fix. Seals on the top Bifold doors with rubber seals can flatten out or