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