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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your existing bifold doors, you need to select the right one. Be sure that they are sealed and weatherproofed to stop water infiltration, air leaks and colder indoor temperatures. To ensure a smooth installation, have a partner assist you. The kit should be about one inch wider than the frame opening, and between 2 and 1 inch shorter on height to ensure that you have enough space for the floor. Selecting the right doors