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