Fan units, namely, electric fans, electric heating fans, electric axial fans, electric centrifugal fans, roof fans, ventilating exhaust fans, electric process air fans, electric duct and tube fans, wall fans, and air curtains, namely, air blowers for creating a barrier of air; ventilation apparatus, namely, ventilating fans for residential, commercial, commercial marine, industrial, agricultural, and medical, pharmaceutical, and scientific laboratory use; electric fans for air conditioning, r...