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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your bifold doors, you need to choose the right ones. Make sure they are properly sealed and weatherproofed to avoid air leaks, water infiltration and lower temperatures inside. To ensure a smooth installation, ask a friend to help. The cabinet you select should have a width that is one-quarter of an inch smaller than the framed opening and between 1 and 2 inches smaller in height to allow for proper clearance for the floor. S