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Bifold Door Seal Replacement Bifold doors are a common choice for hangars, garages and other industrial spaces due to their efficient use of space and swift access. Making sure they are sealed properly is essential to ensure energy efficiency, cleanliness and a comfortable indoor environment. Gaskets can become flat, shrink or break down over time. This causes draughts and water ingress, as well as heat loss. This is a simple and quick fix. Seals