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