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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your existing bifold doors, it's important to choose the right ones. Make sure they're weatherproofed and sealed properly to stop air leaks and water infiltration. To ensure an easy installation, you can have a helper. The kit should be an inch smaller in width than the frame opening and between 1 and 2 inches smaller on height to ensure you have enough sp