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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your bifold doors, it's important to choose the best one. Be sure that they are sealed and weatherproofed to avoid air leaks, water infiltration and colder indoor temperatures. To ensure a smooth installation, ask a friend to help. The kit should be about an inch smaller in width than the frame opening and between 2 and 1 inch shorter on height to ensure that you have enough clearance for the floor. The right doors to choose