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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the correct bifold doors when you want to replace your old ones. Be sure they're weatherproofed and sealed properly to prevent water infiltration and air leaks. To ensure a smooth installation, ask a friend to help. The furniture you select should have a width that is one-quarter of an inch smaller than the opening that is framed and 1 to 2 inches less in heigh