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