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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, it is important to choose the right ones. Be sure they're weatherproofed and properly sealed to stop air leaks and water infiltration. For a seamless installation, you should have a partner assist you. The kit should be about an inch smaller in width than the frame opening and between 1 and 2 inches smaller on height to ensure that you have enough space for the floor.