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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, it's important to select the right one. Be sure that they are sealed and weatherproofed to prevent water infiltration, air leaks and lower temperatures inside. To ensure a smooth installation, you should have a partner assist you. The furniture you select should be a combination of a width approximately one-quarter of an inch smaller than the opening that is framed and between 1 and 2 inches shorter in height to allow for the proper clearance on the floor. S