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How to Prepare an Opening to Replace Bifold Doors It is essential to select the right bifold doors if you're looking to replace your old doors. Make sure they're properly sealed and weatherproofed to stop air leaks, water infiltration, and lower temperatures inside. For a seamless installation, you should have a partner assist you. The kit should be 1/8 inch narrower than the frame opening, and between 1 and 2 inches shorter in height to ensure you have enough space for the floor. Selec