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How to Prepare an Opening to Replace Bifold Doors It is essential to select the correct bifold doors when you want to replace your existing doors. Be sure they're weatherproofed and properly sealed to stop air leaks and water infiltration. To ensure a smooth installation, have a partner assist 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 shorter in height to allow for the proper clearance for the floor. Ch