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How to Prepare an Opening to Replace Bifold Doors It's important to select the best bifold doors if you're looking to replace your old ones. Make sure they're properly sealed and weatherproofed to avoid air leaks, water infiltration, and colder indoor temperatures. To ensure a smooth installation, have a partner assist you. should be approximately one inch wider than the frame opening, and between 1 and 2 inches shorter on height to ensure there is enough