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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the best bifold doors if you are looking to replace your existing doors. Make sure they're weatherproofed and properly sealed to stop water infiltration and air leaks. To ensure a smooth installation, ask a friend to help. The kit should be 1/8 inch narrower than the frame opening, and between 1 and 2 inches shorter on height to ensure there is enough room for the floor. The right doors to choose The kind of door you select will have