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