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How to Prepare an Opening to Replace Bifold Doors It's important to select the correct bifold doors when you're looking to replace your old doors. Make sure they're properly sealed and weatherproofed to avoid air leaks, water infiltration, and lower temperatures inside. To ensure an easy installation, get a partner to assist. The kit should be about an inch smaller in width than the frame opening and between 1 and 2 inches shorter on height to ensure that you have enough cle