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Above a central hallway or at the top of a stairwell will provide the best airflow. > Make sure that there aren t any pipes, wires, rafters or air conditioning or heating ducts running through the space where the GHOST will be installed. The GHOST can NOT be mounted vertically. > Make sure that you have adequate exhaust area out of your attic. This can be accomplished with a combination of roof, ridge or gable end vents. The GHOST requires a minimum of 9 square feet of attic exhaust area. > y y!