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