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