The control switches the motor to {TAIL ~ a speed} substantially slower than the operating condition speed to provide continuing air circulation until the thermostat again calls for {HEAD ~ thermal operation} 
The control switches the motor to { TAIL ~ a speed } substantially slower than the operating condition speed to provide continuing air circulation until the thermostat again calls for { HEAD ~ thermal operation }
OTH OTH OTH OTH OTH OTH 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