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