{HEAD ~ Gas} is delivered by a small compressor, {TAIL ~ blower} or fan through the piping as shown, from a source which may be an on site waste stream or the like 
{ HEAD ~ Gas } is delivered by a small compressor , { TAIL ~ blower } or fan through the piping as shown , from a source which may be an on site waste stream or the like
HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH