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How to Prepare an Opening to Replace Bifold Doors It's important to select the right bifold doors if you're looking to replace your old ones. Make sure they're properly sealed and weatherproofed to prevent water infiltration, air leaks, and colder indoor temperatures. To ensure an easy installation, get a partner to assist. The kit should be approximately 1/8 inch narrower than the frame opening and between 1 and 2 inches smaller in height to ensure there is enough room for the floor. The right doors to choos