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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your bifold doors, you need to choose the right ones. Be sure that they are 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 an inch smaller in width than the frame opening, and between 1 and 2 inches smaller on height to ensure that you have enough clearance for the floor.