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