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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. Make sure they are properly sealed and weatherproofed to prevent water infiltration, air leaks, and lower temperatures inside. To ensure an easy installation, you can get a partner to assist. The kit should be approximately 1/8 inch narrower than the frame opening and between 1 and 2 inches shorter on height to ensure that you have enough space for the floor.