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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your bifold doors, it's important to choose the right ones. Make sure that they are weatherproofed and sealed properly to stop air leaks and water infiltration. To ensure a smooth installation, ask a friend to help. The kit should be about 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. Selecting the right doors The type of doors you select can make a huge difference in the look and feel of your b