A field installable device for a conventional heating and air conditioning system is provided which operates a blower fan in {TAIL ~ conjunction} with {HEAD ~ a standard thermostat} 
A field installable device for a conventional heating and air conditioning system is provided which operates a blower fan in { TAIL ~ conjunction } with { HEAD ~ a standard thermostat }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD