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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 ones. Be sure that they are sealed and weatherproofed to prevent air leaks, water infiltration and lower temperatures inside. To ensure a smooth installation, you should have a partner assist you. The kit should be 1/8 inch narrower than the frame opening and between 1 and 2 inches smaller in height to ensure you have enough clearance for the floor. Th
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