11 Air conditioners; furnaces; heat pumps; fluid coolers being parts for HVAC system; air coolers; water heaters; filters for air conditioning units; electrostatic air filters for air conditioning units; chillers, namely, cooling systems comprising an evaporator, compressor, condenser and expansion device for use in commercial and industrial buildings, blast chillers for commercial food preparation and storage; air delivery and handling units in the nature of air conditioners for cooling, heating, and ventilating; air conditioning units consisting of air induction units, humidifiers, ventilators, diffusers, blenders and convectors; terminal air conditioning units; variable air volume units in the nature of air conditioner; refrigeration machines and parts thereof, namely, compressors, condensers, evaporators, economizers, heat exchangers, receivers, mufflers, and strainers; heat exchangers not being part of machines; fin and tube coils as parts of heating or cooling installations; convectors, namely, radiators, space heating apparatus; ventilators for air conditioning apparatus; roof ventilators for air conditioning apparatus; unit heaters, namely, electric space heater; gas fired unit heaters, namely, gas fired space heater; fans, namely, ventilating fans for commercial and industrial use, ventilating exhaust fans, portable electric fans; centrifugal fans for HVAC units; propeller fans for HVAC units; humidifiers; grilles, namely, ventilation fan accessories; and diffusers for HVAC systems; fans for HVAC air distribution