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