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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your bifold doors, it's important to choose the best one. Make sure they're properly sealed and weatherproofed to stop air leaks, water infiltration, and lower temperatures inside. To ensure a smooth installation, have a partner assist you. The kit should be about an inch smaller in width than the frame opening and between 1 and 2 inches shorter on height to ensure that you have enough space for the floor