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How to Prepare an Opening to Replace Bifold Doors It is essential to select the correct bifold doors when you're looking to replace your old ones. Make sure they're properly sealed and weatherproofed to stop water infiltration, air leaks and lower temperatures inside. 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 height to ensure you have enough clearance for