The invention 11 wherein said wall member has an elongated opening, and wherein {HEAD ~ said gas flow inlet} extends through {TAIL ~ said elongated opening} 
extends through
The invention 11 wherein said wall member has an elongated opening , and wherein { HEAD ~ said gas flow inlet } extends through { TAIL ~ said elongated opening }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL