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How to Prepare an Opening to Replace Bifold Doors It is essential to select the right bifold doors if you are looking to replace your old doors. Be sure that they are sealed and weatherproofed to stop air leaks, water infiltration, and colder indoor temperatures. To ensure an easy installation, ask a friend to help. The kit should be approximately an inch smaller in width than the frame opening, and between 2 and 1 inch shorter in height to ensure you have enough space for the floor. The right doors to choo