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How to Prepare an Opening to Replace Bifold Doors It is essential to select the correct bifold doors when you are looking to replace your old doors. Make sure that they are weatherproofed and properly sealed to stop air leaks and water infiltration. To ensure a smooth installation, you should have a partner assist you. The kit should be approximately one inch wider than the frame opening and between 2 and 1 inch shorter on height to ensure you have enough space for the f