{TAIL ~ The opening} of the exhaust system may also have a tubing to allow {HEAD ~ the exhaled air} to be moved even further away 
{ TAIL ~ The opening } of the exhaust system may also have a tubing to allow { HEAD ~ the exhaled air } to be moved even further away
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH