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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 choose the right ones. Make sure that they are weatherproofed and sealed properly to prevent water leaks and air leaks. For a smooth installation, ask a friend to assist you. 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 for the floor. Selecting