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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you're looking to replace your old doors. Make sure they're weatherproofed and sealed properly 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 one-quarter of an inch smaller than the opening frame 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 choose can have