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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your bifold doors, it is important to choose the right ones. Make 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 an inch smaller in width than the frame opening, and between 1 and 2 inches smaller in height to ensure you have enough space for the floor. Selecting the right doors Th