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How to Prepare an Opening to Replace Bifold Doors It is essential to select the right bifold doors if you want to replace your existing doors. Be sure they're weatherproofed and properly sealed to stop water leaks and air leaks. To ensure a smooth installation, you should have a partner assist you. The cabinet you select should have a combined width about 1/8 of an inch less than the framed opening and between 1 and 2 inches smaller in height to allow for adequate floor clea