Oxygen tank. Air release. Thick.
Oxygen tank releases air. Long hiss.
Oxygen tank release air short
Oxygen tank system beeps with air release
Releasing air from an oxygen tank
The constant hiss of a breathing machine with a person breathing through a mask in the background.
Ambulance interior, an oxygen pump being squeezed
Constant hiss of an oxygen machine or respirator.
Pilot breathing through an oxygen mask