Wind tunnel ventilation: Listen & Download Wind tunnel ventilation .mp3 Error! Change your browser, please! ⇓ Download Compressor discharges air, Construction ⚠ Inflating a mattress ⚠ Air flow ⚠ Air is let through the regulator ⚠ Suction action of air ⚠ Truck Air Brakes ⚠ Helium balloon ⚠ Balloon inflating ⚠ Air is blown through a glass tube ⚠ Air is bleeding through a hose ⚠ Air release with a loud whistling creak, ⚠ Mask breathing ⚠ ★★★★★