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