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How to Prepare an Opening to Replace Bifold Doors It's important to select the best bifold doors if you want to replace your old ones. Make sure they're properly sealed and weatherproofed to avoid water infiltration, air leaks 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 shorter on height to ensure that you have enough space for the floor. Selecting