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