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PROBLEM TO BE SOLVED : To provide a low-cost CPAP that provides a more comfortable air waveform for treatment of sleep disordered breathing. SOLUTION : A low-cost CPAP apparatus is provided in which, upon detection of transition from inhalation to exhalation, a blower motor 10 is de-energized to allow it to freewheel. When pressure in a patient mask 18 (or whatever interface is utilized) reaches a minimum pressure level during exhalation, the motor is re-energized and its speed is controlled so to maintain the pressure at a level suitable for exhalation. Upon detection of transition from exhalation to inhalation, the motor speed is increased to provide higher pressures in the patient mask suitable for inhalation. COPYRIGHT : (C)2013, JPO&INPIT