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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your existing bifold doors, it's important to choose the right ones. Be sure that they are sealed and weatherproofed to prevent water infiltration, air leaks and colder indoor temperatures. To ensure an easy installation, you can ask a friend to help. The kit you choose should be a combination of a width approximately 1/8 of an inch less than the opening frame and 1 to 2 inches less in height to allow for the proper clearance on the