Air handlers; air conditioning, air cooling and ventilation apparatus and instruments; air conditioning terminal units; air handling devices, namely, registers, grilles and diffusers used to control and adjust the pattern, movement, distribution and flow of air in heating, ventilating and air conditioning systems; air cleaning units; air filtering units and installations; air filters for industrial installations; air filters for domestic use; fan and blower coils as part of heating, cooling and ventilation installations; dampers, namely, control devices used in air ducts to regulate the flow of air; ventilating louvers; chilled beams, namely, air distribution devices that use water to transfer heat to and from a room