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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you want to replace your existing doors. Make sure they're weatherproofed and sealed properly to stop water leaks and air leaks. For a smooth installation, ask a friend to assist you. The cabinet you select should be a combination of a width approximately one-quarter of an inch smaller than the framed opening and 1 to 2 inches less in height to allow for adequate floor clearance. Selecting the right