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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, it is important to select the right one. Be sure they're weatherproofed and sealed properly to stop water leaks and air leaks. To ensure an easy installation, you can ask a friend to help. The kit should be approximately one inch wider than the frame opening and between 2 and 1 inch shorter on height to ensure that there is enough room for the floor. The right doors to choose The kind of door you se