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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the best bifold doors if you are looking to replace your old ones. Make sure they're properly sealed and weatherproofed to avoid water infiltration, air leaks and colder indoor temperatures. To ensure a smooth installation, you should have a partner help you. The cabinet you select should have a combined width about one-quarter of an inch smaller than the framed opening and between 1 and 2 inches shorter in height to all