Used with one burner of a dual burner grill, the wall confines the hot gases and radiant energy to half of {HEAD ~ the grate} to conserve {TAIL ~ fuel} 
to conserve
Used with one burner of a dual burner grill , the wall confines the hot gases and radiant energy to half of { HEAD ~ the grate } to conserve { TAIL ~ fuel }
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