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How to Prepare an Opening to Replace Bifold Doors It's important to select the correct bifold doors when you are looking to replace your old ones. Make sure they're properly sealed and weatherproofed to stop water infiltration, air leaks and colder indoor temperatures. For a seamless installation, you should have a partner assist you. The cabinet you select should be a combination of a width approximately 1/8 of an inch less than the opening that is framed and 1 to 2 inches less in height to allow for