The air outlet device for the interior of a vehicle, particularly for being arranged above a seat of a vehicle such as, e. In the housing there is provided a main piston with an enlarged portion, which together with the housing define a third cylinder space, which can be connected to the compressed air inlet. The first short circuit detection circuit is configured to drive the first conductive line with a first signal having a first logic level. Even if blood happens to enter the driving section, the blood is mixed with the sealing liquid and does not coagulate.