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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your bifold doors, it is important to select the right one. Make sure they are properly sealed and weatherproofed to prevent air leaks, water infiltration and lower temperatures inside. To ensure an easy installation, you can 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 ensure that you have enough cle