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Bifold Door Seal Replacement Due to their space-saving design and ease of access bifold doors are popular for hangars, garages and other industrial spaces. Maintaining them properly sealed is essential for energy efficiency and hygiene, as well as a pleasant indoor space. Gaskets can become flat, shrink or break down over time. This causes draughts and water ingress, and heat loss. This is a simple and quick fix. Seals on the top Over time, the rubber seals on a bifold can flatten