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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your existing bifold doors, you need to choose the best one. Be sure they're weatherproofed and properly sealed to prevent water infiltration and air leaks. For a seamless installation, ask a friend to help you. The kit should be 1/8 inch narrower than the frame opening and between 2 and 1 inch shorter on height to ensure that there is enough room for the floor. The right doors to choose The kind of door you