The supply duct 18 is connected to at least one hollow structural member 20 adapted to replace a conventional tie 12 and having discharge nozzle 22 or an upstanding discharge elbow duct 24 connected to a distribution duct 26 to discharge heated air from {TAIL ~ the housing} 14 to desired points along {HEAD ~ the assembly} 2 
The supply duct 18 is connected to at least one hollow structural member 20 adapted to replace a conventional tie 12 and having discharge nozzle 22 or an upstanding discharge elbow duct 24 connected to a distribution duct 26 to discharge heated air from { TAIL ~ the housing } 14 to desired points along { HEAD ~ the assembly } 2
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH