{TAIL ~ Gases} that are produced during this transformation are removed by {HEAD ~ way} of gas flue 6 
{ TAIL ~ Gases } that are produced during this transformation are removed by { HEAD ~ way } of gas flue 6
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH