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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your bifold doors, you need to choose the best one. Be sure that they are sealed and weatherproofed to stop water infiltration, air leaks and lower temperatures inside. For a smooth installation, have a partner assist you. The cabinet you select should be a combination of a width approximately an inch less than the opening that is framed and 1 to 2 inches smaller in height to allow for adequate floor clearance. Selecting the right doors The type of door you choose wi