In yet another preferred embodiment, {HEAD ~ the source} of heated air and the hollow structural member are connected by {TAIL ~ a flexible connection} which permits axial and rotational between the source of heated air and the hollow structural member 
are connected by
In yet another preferred embodiment , { HEAD ~ the source } of heated air and the hollow structural member are connected by { TAIL ~ a flexible connection } which permits axial and rotational between the source of heated air and the hollow structural member
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH