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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your bifold doors, it is important to select the right one. Make sure they are properly sealed and weatherproofed to prevent water infiltration, air leaks and lower temperatures inside. To ensure a smooth installation, get a partner to assist. The furniture you select should be a combination of a width approximately 1/8 of an inch less than the opening frame and between 1 and 2 inches shorter in height to allow for the proper clea