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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your bifold doors, it's important to select the right one. Be sure they're weatherproofed and properly sealed to prevent water leaks and air leaks. To ensure an easy installation, you can have a helper. The kit should be approximately one inch wider than the frame opening and between 1 and 2 inches smaller on height to ensure there is enough room for the floor. The right doors to choose The kind of door you pick will ha