The Armstrong Air 207167 Discharge Air Sensor is a replacement part for your air conditioning unit. This sensor monitors the air discharge from your unit and sends an alert if the discharge exceeds a certain level. This sensor is a replacement for the Armstrong Air 207167 Discharge Air Sensor. The Armstrong Air 207167 Discharge Air Sensor is a replacement part for your air conditioning unit. This sensor monitors the air discharge from your unit and sends an alert if the discharge exceeds a certain level. This sensor is a replacement for the Armstrong Air 207167 Discharge Air Sensor.