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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your existing bifold doors, you need to choose the best one. Make sure they're properly sealed and weatherproofed to avoid air leaks, water infiltration, and colder indoor temperatures. To ensure an easy installation, get a partner to assist. The kit should be approximately an inch smaller in width than the frame opening, and between 1 and 2 inches smaller in height to ensure there is enough room for the floor. The right d