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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your bifold doors, it is important to select the right one. Be sure that they are sealed and weatherproofed to prevent water infiltration, air leaks and colder indoor temperatures. To ensure a smooth installation, you should have a partner help you. The kit should be approximately an inch smaller in width than the frame opening, and between 1 and 2 inches smaller on height to ensure you have enou