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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your existing bifold doors, you need to select the right one. Make sure they're properly sealed and weatherproofed to avoid air leaks, water infiltration, and colder indoor temperatures. For a seamless installation, ask a friend to assist you. The kit should be about one inch wider than the frame opening, and between 1 and 2 inches shorter in height to ensure you have enough clearance for the floor. The righ