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