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