by an energy recovery system 42 of the type described above a filter 76 is provided immediately upstream of the paint spray booth 12 in order to remove any solid or liquid contaminants which are suspended in the air mass a supply fan 78 is provided drawing flow into the ducting 52 and the various conditioning apparatus and thence into a plenum 80 above the ceiling of the paint spray booth 12 a supply damper and controller 82 are provided in order to control the volume of air flow in the chamber to the system requirements referring to fig2 the details of the air conditioning apparatus 44 are depicted this typically includes three sections of heat exchangers 46 48 and 50 disposed to intercept respective portions of the air flow passing through the ducting 52 disposed upstream of each section of the heat exchangers 46 48 and 50 are corresponding groups of spray nozzles 54 including respective groups 84 86 and 88 positioned so as to direct a spray onto the front face of each of the heat exchanger sections each spray nozzle group includes individual spray nozzles 90 located in a pattern such as to cover the area of the heat exchanger sections 46 48 and 50 in a density of approximately one per square foot of the cross sectional area each of the spray nozzles 90 is controlled with solenoid operated shut off valves 92 such as to allow individual control of water flow to the spray nozzles 90 water under pressure is provided via.