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How to Prepare an Opening to Replace Bifold Doors It is essential to select the right bifold doors if you want to replace your old ones. Be sure they're weatherproofed and properly sealed to stop air leaks and water infiltration. To ensure an easy installation, get a partner to assist. The kit should be about 1/8 inch narrower than the frame opening and between 2 and 1 inch shorter on height to ensu