{HEAD ~ The second regiater} is connected to the ends of the second air circuit and provides, in the first operational position, for {TAIL ~ atmospheric fresh air intake} at the second heat exchange chamber and discharge into the residential area 
provides for
{ HEAD ~ The second regiater } is connected to the ends of the second air circuit and provides , in the first operational position , for { TAIL ~ atmospheric fresh air intake } at the second heat exchange chamber and discharge into the residential area
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH