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 {HEAD ~ a distribution duct} 26 to discharge {TAIL ~ heated air} from the housing 14 to desired points along the assembly 2 
to discharge
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 { HEAD ~ a distribution duct } 26 to discharge { TAIL ~ heated air } from the housing 14 to desired points along the assembly 2
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