Inflating a mattress: Listen & Download Inflating a mattress .mp3 Error! Change your browser, please! ⇓ Download Blower, air broom ⚠ Balloon inflating ⚠ Air is let through the regulator ⚠ Soccer ball ⚠ Rope torsion ⚠ Inflating a mattress ⚠ Wind tunnel ventilation ⚠ Air pressure ⚠ Compressor discharges air, Construction ⚠ Air compressor operation ⚠ Balloon descent ⚠ Air release with a loud whistling creak, ⚠ ★★★★★