A fan is mounted to the housing and is operably disposed, preferably, within the plenum to draw {HEAD ~ air} from {TAIL ~ the plenum} and to exhaust the air outside of the housing 
from
A fan is mounted to the housing and is operably disposed , preferably , within the plenum to draw { HEAD ~ air } from { TAIL ~ the plenum } and to exhaust the air outside of the housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH