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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 existing doors. Make sure they're weatherproofed and sealed properly to stop water leaks and air leaks. To ensure a smooth installation, you should have a partner help you. The kit should be 1/8 inch narrower than the frame opening, and between 1 and 2 inches shorter on height to ensure that there is enough room for the floor. Choosing the right doors The kind of door y