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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, it's important to choose the best one. Make sure they're weatherproofed and sealed properly to prevent air leaks and water infiltration. To ensure an easy installation, have a helper. The kit should be approximately one inch wider than the frame opening, and between 1 and 2 inches shorter on height to ensure that you have enough space for the floor. Selecting the right