The WhisperFlow CPAP System is a precision venturi device that uses an oxygen
supply in conjunction with entrained air to generate an output flow. The
WhisperFlow System uses a 60 psi (412 kPa) oxygen supply, and can generate
flows over 150 L/min. down to 28% fractional inspired oxygen (FIO2). The
WhisperFlow CPAP valves, which are placed within the circuit, are used to
maintain preset positive pressure at flow rates from 10 to 150 L/min.