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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you are looking to replace your old ones. Make sure they're properly sealed and weatherproofed to stop air leaks, water infiltration and lower temperatures inside. For a smooth installation, have a partner assist you. The kit should be about 1/8 inch narrower than the frame opening, and between 1 and 2 inches shorter on height to ensure that you have enough clearance for the floor. The ri
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