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How to Prepare an Opening to Replace Bifold Doors It is essential to select the best bifold doors if you want to replace your old doors. Be sure they're weatherproofed and properly sealed to stop water leaks and air leaks. For a seamless installation, have a partner help you. The furniture you select should have a combined width about an inch less than the opening that is framed and 1 to 2 inches shorter in height to allow for adequate clearance on the floor. Selecting the right doors The kind of door you se