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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, it's important to select the right one. Make sure that they are weatherproofed and properly sealed to stop water infiltration and air leaks. For a smooth installation, ask a friend to help you. The kit should be about an inch smaller in width than the frame opening and between 1 and 2 inches smaller in height to ensure there is enough room for the floor. Choosing the ri