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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your bifold doors, you need to choose the right ones. Be sure that they are sealed and weatherproofed to avoid water infiltration, air leaks, and colder indoor temperatures. To ensure an easy installation, you can get a partner to assist. The kit should be one inch wider than the frame opening, and between 1 and 2 inches shorter on height to ensure that you have enoug