A blower unit is connected to the motor to draw {HEAD ~ air} from the inlet to {TAIL ~ the outlet} 
to
A blower unit is connected to the motor to draw { HEAD ~ air } from the inlet to { TAIL ~ the outlet }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL