Class 007: Motors for fan and blower assemblies for heating, ventilating and air conditioning products; Fan blades for fan and blower assemblies in heating, ventilating and air conditioning products; Variable frequency drives for motors, other than for land vehicles, specifically for fan and blower assemblies for heating, ventilating, and air conditioning products; Active and passive sound attenuation devices, namely, silencers for motors and engines of heating, ventilating and air conditioning products; Class 009: Microphones for fan and blower assemblies for heating, ventilating and air conditioning products, audio speakers for fan and blower assemblies for heating, ventilating and air conditioning products; component parts for heating, ventilating, and air conditioning products, namely, control systems consisting primarily of electric control devices for fan and air blower assemblies; Class 011: Heating, cooling, refrigerating, ventilation and energy recovery equipment, namely, air handlers and packages and custom-engineered air conditioners, chillers, namely, process chillers that provide temperature-controlled fluid to heating and cooling devices, gas, electric, hydronic and solar heating installations; ventilation fans for residential, commercial and industrial use; humidifiers and dehumidifiers for commercial and industrial use, and steam generators; heating, ventilating and air conditioning products, namely, ventilating louvers; sound silencers sold as an integral component of fan and air blower assemblies and heating, cooling, refrigerating, ventilating, air quality and energy recovery equipment; inlet cones for the flow of air for use in fan and air blower assemblies; dampers, namely, control devices used in air ducts to regulate the flow of air; fume hoods; laboratory exhaust systems, namely, ventilation exhaust fans, and air blowers; and smoke and gas evacuation systems consisting primarily of venting, ventilation exhaust fans, and air blowers