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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your existing bifold doors, it's important to select the right one. Make sure they're properly sealed and weatherproofed to avoid water infiltration, air leaks and lower temperatures inside. For a seamless installation, ask a friend to help you. The kit should be about one inch wider than the frame opening, and between 1 and 2 inches smaller on height to ensure you have enough clearance for the floor. Selecting the right