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How to Prepare an Opening to Replace Bifold Doors It's important to select the best bifold doors if you are looking to replace your old doors. Make sure they are properly sealed and weatherproofed to avoid water infiltration, air leaks, and colder indoor temperatures. To ensure a smooth 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 on height to ensure you have enough space for the floor. Selecting the right doors