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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your existing bifold doors, it's important to choose the right ones. Make sure that they are weatherproofed and sealed properly to stop water infiltration and air leaks. To ensure an easy installation, ask a friend to help. The kit should be approximately 1/8 inch narrower than the frame opening, and between 2 and 1 inch shorter in height to ensure you have enough space for the floor. Selecting t