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How to Prepare an Opening to Replace Bifold Doors It is essential to select the correct bifold doors when you are looking to replace your existing doors. Make sure they're properly sealed and weatherproofed to prevent water infiltration, air leaks and colder indoor temperatures. For a smooth installation, have a partner help you. The cabinet you select should be a combination of a width approximately one-quarter of an inch smaller than the opening frame and 1 to 2 inches less in height to