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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you want to replace your old ones. Make sure they are properly sealed and weatherproofed to prevent air leaks, water infiltration, and colder indoor temperatures. To ensure an easy installation, ask a friend to help. The kit should be about an inch smaller in width than the frame opening, and between 2 and 1 inch shorter in hei