| ReturnTo Theme-Group-Choice | Onelevelup |
| 3L053 | Central air conditioning | |
| F24F3/00 -3/167 | ||
| F24F3/00@B | BA | BA00 HEAT SOURCES |
BA01 | BA02 | BA03 | BA04 | BA05 | BA06 | BA10 | |||
| . Geothermal heat sources | . . Under-floor air spaces | . Solar-heat sources | . . Above-ceiling air spaces | . Well water | . Thermal accumulators | . Others | ||||||
| F24F3/00@Z;3/044;3/00 | BB | BB00 CENTRAL DEVICE EQUIPMENT STRUCTURE |
BB01 | BB02 | BB03 | BB04 | BB05 | BB06 | BB07 | BB10 | ||
| . External air-intake devices | . Heaters | . . Water-heating coils | . Coolers | . . Water-cooling coils | . Heat-recovery devices | . Heat-exchanger bypass paths | . Others | |||||
| F24F3/14;3/147 | BC | BC00 HUMIDIFYING AND DEHUMIDIFYING MEANS |
BC01 | BC02 | BC03 | BC04 | BC05 | BC06 | BC07 | BC08 | BC09 | BC10 |
| . Dehumidifying means | . . Coolers | . . Moisture-absorbing agents | . . Moisture-absorbing filters | . Humidifying means | . . Heated-water or steam sprays | . Heat- or humidity-transmission means | . . Heat exchangers | . . . Rotating heat exchangers | . Others | |||
| F24F3/16-3/167 | BD | BD00 AIR PURIFICATION MEANS |
BD01 | BD02 | BD03 | BD04 | BD05 | BD10 | ||||
| . Ion or ozone generators | . Air purifying devices | . . Filters | . . . Multiple filters | . Sterilization devices | . Others |