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 {HEAD ~ the second heat exchange chamber} and discharge into the residential area 
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 { HEAD ~ the second heat exchange chamber } and discharge into the residential area
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH