In other embodiments, {HEAD ~ the joiner} may be provided with {TAIL ~ an air outlet portion} such as a diffuser outlet 
In other embodiments , { HEAD ~ the joiner } may be provided with { TAIL ~ an air outlet portion } such as a diffuser outlet
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH