It should be appreciated that the heated air in {TAIL ~ the plenum chamber} 28 passes though the inner perforated wall 32 in the general direction of {HEAD ~ arrow} 42  
It should be appreciated that the heated air in { TAIL ~ the plenum chamber } 28 passes though the inner perforated wall 32 in the general direction of { HEAD ~ arrow } 42
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH