Abstract: A new Continuous/Bi-Level Positive Airway Pressure device (C/BiPAP) is operable to deliver breathing gas such as air, oxygen or a mixture thereof at relatively higher and lower pressures (i.e., generally equal to or above ambient atmospheric pressure) to a patient either as preset or in proportion to the patient's respiratory flow for treatment of Obstructive Sleep Apnea Syndrome (OSAS). The device can be for a single patient or a Dual C/BiPAP having similar elements to the C/BiPAP. A control system can receive inputs for a delta coefficient. The delta coefficient allows a medical professional or the user to designate a stepwise or segmented increase or decrease in pressure from the start of the treatment and/or during the treatment. The C/BiPAP can also include a humidifier, a heater/cooler for the gas, a dehumidifier, a leak detector, a filter to filter allergens and/or dust, an emergency condition detector and a medication chamber.