7620 Fan coil units (0) Fan coil units 7621 Packaged air-conditioning (6) One piece and split, direct expansion (DX), packaged air conditioning plant with nominal cooling capacities greater than 7.5 kW, including air cooled and water cooled types, conventional comfort plant and close control packaged plant 7622 Air handling plant (38) All types of air handling plant ranging from small room fan coil units to large built-up air handlers 7623 Fans (1) Centrifugal, axial flow, mixed flow and propeller fans as part of roof mounted fans, in-line and window/wall mounted fans of the type commonly used in airconditioning and ventilation systems 7624 Air filters (0) Air filters commonly used in mechanical systems including; dry media dust filters (HEPA, viscous impingement and electrostatic), grease filters and gas phase adsorbers (active carbon) 7625 Air coils (0) Finned tube coils used in heating and cooling systems including water and refrigerant coils 7626 Humidifiers (3) Generally proprietary self-generating electric steam humidifiers that produce steam at atmospheric pressure 7628 VRF air-conditioning (44) 2-pipe and 3-pipe Variable Refrigerant Flow (VRF) inverter heat pump multi-system air-conditioning plant usually with nominal cooling capacities greater than 9 kW. Air cooled types including cooling only and Heat Pump recovery systems, and water cooled types including cooling only and Heat Pump recovery systems.