In the second operational position, the first register provides for atmospheric fresh air intake at the compressor and supplies {HEAD ~ the residence} with {TAIL ~ the turbine discharge air} 
In the second operational position , the first register provides for atmospheric fresh air intake at the compressor and supplies { HEAD ~ the residence } with { TAIL ~ the turbine discharge air }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL