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How to Prepare an Opening to Replace Bifold Doors It's important to select the correct bifold doors when you want to replace your old doors. Make sure and properly sealed to stop water leaks and air leaks. To ensure an easy installation, get a partner to assist. The kit should be one inch wider than the frame opening, and between 2 and 1 inch shorter on height to ensure you have enough space for the floor. Choosing the right doors The type of doors you select can make a big impact on the appearance and feel of your business. Bifold doors are a c