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How to Prepare an Opening to Replace Bifold Doors It's important to select the best bifold doors if you are looking to replace your old doors. Make sure that they are weatherproofed and properly sealed to prevent water leaks and air leaks. To ensure a smooth installation, have a helper. The kit should be 1/8 inch narrower than the frame opening and between 1 and 2 inches smaller on height to ensure that you have enough space for the floor. Selecting the right doors The type of doo