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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your existing bifold doors, it is important to select the right one. Be sure they're weatherproofed and properly sealed to prevent water leaks and air leaks. To ensure a smooth installation, ask a friend to help. The furniture you select should have a combined width about 1/8 of an inch less than the opening that is framed and 1 to 2 inches shorter in height to allow for the proper clearance on the fl