In such an arrangement, {HEAD ~ the air} from the interior of the indoor institution is introduced into the cyclone wherein {TAIL ~ dust} in the air is removed 
In such an arrangement , { HEAD ~ the air } from the interior of the indoor institution is introduced into the cyclone wherein { TAIL ~ dust } in the air is removed
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH