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How to Prepare Opening to Replace Bifold Doors If you are looking to replace your existing bifold doors, it's important to select the right one. Make sure that they are weatherproofed and sealed properly to prevent water infiltration and air leaks. For a seamless installation, you should have a partner help you. The furniture you select should have a combined width about one-quarter of an inch smaller than the opening frame and between 1 and 2 inches less in height to allow for proper floor clearanc