A fugitive gas pipe supplies the fugitive gases to the air intake and {HEAD ~ a vent} allows the fugitive gases to vent to {TAIL ~ atmosphere} 
A fugitive gas pipe supplies the fugitive gases to the air intake and { HEAD ~ a vent } allows the fugitive gases to vent to { TAIL ~ atmosphere }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL