After {HEAD ~ discharge} from the cyclone, {TAIL ~ the air} is mixed and sterilized with ozone gas 
After { HEAD ~ discharge } from the cyclone , { TAIL ~ the air } is mixed and sterilized with ozone gas
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH