The first register is connected to the ends of the first air circuit, in the first operational position, to provide for residential used air intake at the compressor and {HEAD ~ expulsion} of the turbine discharge air into {TAIL ~ the atmosphere} 
The first register is connected to the ends of the first air circuit , in the first operational position , to provide for residential used air intake at the compressor and { HEAD ~ expulsion } of the turbine discharge air into { TAIL ~ the atmosphere }
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 OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL