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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 existing doors. Make sure that they are weatherproofed and sealed properly to prevent air leaks and water infiltration. For a seamless installation, ask a friend to help you. The kit should be approximately one inch wider than the frame opening and between 1 and 2 inches smaller on height to ensure there is enough room for the floor. The right door to choose The kind of