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