Efficient and effective residential air handling devices.

This study examined the efficiencies of residential ventilation and furnace fans . The scope included a detailed review of motor and motor control t echnology , fan design issues and an international search of motor / fan combinations of conventional and higher - efficiency . It was found that current residential air handlers are often ten times less efficient than their  larger commercial counterparts . Cost effectiveness considerations of ventilation and furnace fans ( the most energy intensive applications ) , showed that dramatic improvement s in efficiency are justifiable .