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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 existing doors. Make sure they're weatherproofed and properly sealed to prevent water leaks and air leaks. For a seamless installation, you should have a partner help you. The furniture you select should have a width that is 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