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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, it's important to choose the best one. 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 kit you choose should have a combined width about an inch less than the opening that is framed and between 1 and 2 inches shorter in height to allow for proper