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