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How to Prepare an Opening to Replace Bifold Doors It's important to select the correct bifold doors when you are looking to replace your existing doors. Be sure they're weatherproofed and sealed properly to stop air leaks and water infiltration. For a seamless installation, ask a friend to assist you. The kit should be one inch wider than the frame opening, and between 1 and 2 inches shorter in height to ensure you have enough space for the floor. Selecting the right door The