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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the correct bifold doors when you're looking to replace your old ones. Make sure that they are weatherproofed and properly sealed to stop water leaks and air leaks. For a smooth installation, ask a friend to help you. The kit you choose should be a combination of a width approximately 1/8 of an inch less than the opening that is framed and between 1 and 2 inches smaller in height to allow for p