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How to Prepare an Opening to Replace Bifold Doors It is essential to select the right bifold doors if you're looking to replace your existing doors. Make sure they're properly sealed and weatherproofed to prevent air leaks, water infiltration and colder indoor temperatures. To ensure an easy installation, you can have a helper. The furniture 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 ad