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