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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the correct bifold doors when you want to replace your old doors. Be sure that they are sealed and weatherproofed to prevent water infiltration, air leaks and colder indoor temperatures. To ensure an easy installation, ask a friend to help. The kit you choose should be a combination of a width approximately an inch less than the framed opening and 1 to 2 inches shorter in height to allow for the proper f