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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you're looking to replace your old doors. Be sure they're weatherproofed and sealed properly to prevent air leaks and water infiltration. To ensure an easy installation, you can ask a friend to help. The kit should be about 1/8 inch narrower than the frame opening and between 1 and 2 inches shorter on height to ensure you have enough clearance for the floor. The right door to choose The type of door you choo