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How to Prepare an Opening to Replace Bifold Doors It's important to select the right bifold doors if you want to replace your old doors. Be sure that they are sealed and weatherproofed to prevent air leaks, water infiltration, and lower temperatures inside. To ensure a smooth installation, get a partner to assist. The kit should be about 1/8 inch narrower 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 right door The