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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the correct bifold doors when you're looking to replace your existing doors. Be sure they're weatherproofed and properly sealed to prevent water infiltration and air leaks. To ensure an easy installation, you can have a helper. The furniture you select should be a combination of a width approximately an inch less than the opening frame and 1 to 2 inches smaller in height to allow for adequate clearance for the floor. Choosing the right