The exhaust gas 1 then flows to a gap 14 through {HEAD ~ one or more air holes} 15 provided at {TAIL ~ the outer circumferential section} of the shielding plate 17 
provided at
The exhaust gas 1 then flows to a gap 14 through { HEAD ~ one or more air holes } 15 provided at { TAIL ~ the outer circumferential section } of the shielding plate 17
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH