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How to Prepare an Opening to Replace Bifold Doors It's important to select the right bifold doors if you are looking to replace your old doors. Be sure that they are sealed and weatherproofed to prevent air leaks, water infiltration and colder indoor temperatures. To ensure a smooth installation, ask a friend to help. The furniture you select should be a combination of a width approximately an inch less than the opening frame and 1 to 2 inches smaller in height to allow for proper clearance f