Austroflamm Integra II Pellet Stove Air Sensor (Pre 2006): B11769. This sensor measures thespeed,temperature,humidityanddensityof incoming air and relays that information to the circuit board. The air sensor can cause the board to adjust combustion air and fuel feed to fine tune the air/fuel ratio. If the sensor detects that there is not enough air flowing through the unit, it can cause the stove to shut down.