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