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