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How to Prepare an Opening to Replace Bifold Doors If you are looking to replace your bifold doors, it's important to choose the best one. Be sure that they are sealed and weatherproofed to avoid air leaks, water infiltration and colder indoor temperatures. For a seamless installation, you should have a partner assist you. The kit you choose should have a combined width about 1/8 of an inch less than the opening frame and 1 to 2 inches smaller in height to allow for the proper clearance for the floor. Choo