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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you're looking to replace your existing doors. Make sure they're weatherproofed and properly sealed to prevent water leaks and air leaks. To ensure a smooth installation, ask a friend to help you. The furniture you select should be a combination of a width approximately an inch less than the opening that is framed and between 1 and 2 inches shorter in height to allow for proper