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