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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 existing doors. Make sure they are properly sealed and weatherproofed to stop 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 1/8 inch narrower than the frame opening, and between 1 and 2 inches shor
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