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