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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the correct bifold doors when you are looking to replace your existing doors. Make sure that they are weatherproofed and sealed properly to stop water infiltration and air leaks. For a smooth installation, ask a friend to assist you. The kit you choose should have a combined width about one-quarter of an inch smaller than the framed opening and between 1 and 2 inches less in height to allow for the prope