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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 existing doors. Be sure that they are sealed and weatherproofed to avoid air leaks, water infiltration, and colder indoor temperatures. To ensure an easy installation, you can ask a friend to help. The kit should be approximately an inch smaller in width than the frame opening and between 1 and 2 inches smaller on height to ensure that you have enough space fo