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