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