{HEAD ~ The supply duct} 18 is connected to {TAIL ~ 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 the housing 14 to desired points along the assembly 2 
is connected to
{ HEAD ~ The supply duct } 18 is connected to { TAIL ~ 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 the housing 14 to desired points along the assembly 2
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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