An exhaust fan is configured to draw {HEAD ~ air} into the housing through {TAIL ~ the evaporative medium pad} and out the exhaust vent 
An exhaust fan is configured to draw { HEAD ~ air } into the housing through { TAIL ~ the evaporative medium pad } and out the exhaust vent
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH