{HEAD ~ Heated air} can flow by natural convection or with {TAIL ~ blower assistance} through a plenum in the solar heating wall panel to and from connected ducting 
flow with
{ HEAD ~ Heated air } can flow by natural convection or with { TAIL ~ blower assistance } through a plenum in the solar heating wall panel to and from connected ducting
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH