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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you are looking to replace your old doors. Be sure that they are sealed and weatherproofed to prevent air leaks, water infiltration and lower temperatures inside. For a seamless installation, ask a friend to help you. The kit should be one inch wider than the frame opening and between 1 and 2 inches shorter on height to ensure that you have enough clearance for t