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