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How to Prepare an Opening to Replace Bifold Doors It is essential to select the right bifold doors if you're looking to replace your old doors. Be sure that they are sealed and weatherproofed to avoid air leaks, water infiltration, and colder indoor temperatures. For a smooth installation, have a partner assist you. The kit should be about one inch wider than the frame opening, and between 1 and 2 inches smaller on height to ensure that you have enough clearance for the floor. Selecting the