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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, you need to select the right one. Be sure they're weatherproofed and sealed properly to prevent air leaks and water infiltration. To ensure a smooth installation, ask a friend to help. The cabinet you select should be a combination of a width approximately an inch less than the framed opening and between 1 and 2 inches less in height to allow for proper clearance for the floo