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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 existing doors. Make sure they're properly sealed and weatherproofed to stop air leaks, water infiltration and colder indoor temperatures. To ensure a smooth installation, get a partner to assist. The kit should be about one inch wider than the frame opening, and between 2 and 1 inch shorter on height to ensure you have enough clearance for the floor. Choosing the r