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A CPAP or other ventilation system includes a mask, a flow generator, a positive or high pressure line to provide positive or high pressure air from the flow generator to the mask and a vacuum or return line provided to actively extract exhaled gas from the breathing chamber and/or the air delivery

A CPAP or other ventilation system includes a mask, a flow generator, a positive or high pressure line to provide positive or high pressure air from the flow generator to the mask and a vacuum or return line provided to actively extract exhaled gas from the breathing chamber and/or the air delivery conduit of the mask. The vacuum or return line includes a vent outlet preferably positioned remote from the mask.

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1. A continuous positive airway pressure (CPAP) system comprising: a mask adapted to provide CPAP to a patient, the mask including a breathing chamber;a flow generator in communication with the mask;a positive pressure line to provide positive pressure air from the flow generator to the mask;a vacuu

1. A continuous positive airway pressure (CPAP) system comprising: a mask adapted to provide CPAP to a patient, the mask including a breathing chamber;a flow generator in communication with the mask;a positive pressure line to provide positive pressure air from the flow generator to the mask;a vacuum or return line provided to actively remove gas exhausted by the patient; anda vent outlet in communication with the vacuum or return line to vent the gas exhausted by the patient, the vent outlet provided at a location that is remote from the mask. 2. The CPAP system of claim 1, wherein the mask includes a nozzle assembly including a pair of nozzles provided for respective nares of the patient. 3. The CPAP system of claim 2, wherein at least one of the nozzles includes a dual wall construction including an inner wall and an outer wall defining a substantially annular passage therebetween in communication with the vacuum line. 4. The CPAP system of claim 2, wherein the nozzle assembly includes a first end portion with an elbow in communication with the positive pressure line and a second end portion with an elbow in communication with the vacuum line. 5. The CPAP system of claim 2, wherein the nozzle assembly includes a first end portion that is closed and a second end portion provided with an elbow, the nozzle assembly including a main body having a baffle therein to define a first chamber in communication with the positive pressure line and a second chamber in communication with the vacuum line. 6. The CPAP system of claim 5, wherein the elbow includes at least a portion of each of the positive pressure line and the vacuum line. 7. The CPAP system of claim 5, wherein the baffle is generally planar or a hollow cylinder. 8. The CPAP system of claim 1, wherein the mask includes a port to communicate the passage with the vacuum or return line. 9. The CPAP system of claim 1, wherein the flow generator includes a blower and a vacuum pump. 10. The CPAP system of claim 9, wherein the vacuum pump and the blower comprise separate components. 11. The CPAP system of claim 9, wherein the vacuum pump is integral with the blower. 12. The CPAP system of claim 11, wherein the integral vacuum pump and blower include a motor including first and second shaft ends and respective supply and vacuum impellers provided thereto. 13. A CPAP system of claim 1, further comprising a control member or valve provided to the flow generator in communication with the vacuum or return line, wherein the control member or valve is controlled based on the sensing of at least one of pressure, flow and CO2. 14. The CPAP system of claim 13, wherein the control member or valve is controlled at least in part based on a breathing pattern of the patient, wherein the control member or valve is closed during inhalation and open during exhalation. 15. The CPAP system of claim 1, further comprising a blow-in valve provided to the positive pressure line. 16. The CPAP system of claim 1, further comprising a bypass provided to the vacuum or return line, the bypass having access to a source of pressurized gas which is accelerated via a venturi, to thereby actively draw gas exhaled by the patient along the vacuum or return line. 17. The CPAP system of claim 1, wherein the vacuum line is coupled to a vacuum pump operable at a constant rate. 18. The CPAP system of claim 1, wherein the vacuum line is coupled to a vacuum pump operable at a variable rate. 19. The CPAP system of claim 18, wherein the vacuum pump is operable at two or more speeds based on patient input. 20. The CPAP system of claim 1, wherein flow through of the vacuum or return line is delayed for a predetermined time after sensing a predetermined parameter. 21. The CPAP system of claim 1, wherein the vacuum or return line is in communication with a valve to direct at least a portion of gas to cool a blower within the flow generator. 22. The CPAP system of claim 1, further comprising a vacuum pump provided to the vacuum line, wherein, if or when the vacuum pump is not drawing exhaled gas along the vacuum line, a positive pressure side of the vacuum pump may be diverted back to the positive pressure line to assist with delivering the positive pressure gas to the patient. 23. The CPAP system of claim 1, further comprising a vacuum pump in communication with the vacuum line, the vacuum pump being mounted on the mask. 24. The CPAP system of claim 1, further comprising a vacuum pump in communication with the vacuum line and being controllable to increase negative flow just before and/or during exhalation by the patient. 25. The CPAP system of claim 24, wherein the vacuum pump is controllable to decrease negative pressure and/or increase flow during inhalation of the patient. 26. A CPAP system of claim 1, further comprising means to reduce condensation within the positive pressure line and/or the vacuum line. 27. The CPAP system of claim 26, wherein the means includes heater means that vaporizes or evaporates water in the vacuum line or the positive pressure line. 28. The CPAP system of claim 27, wherein exhausted gas is actively extracted adjacent the mask. 29. The CPAP system of claim 28, wherein the exhausted gas is actively extracted from the breathing chamber. 30. The CPAP system of claim 28, wherein the exhausted gas is actively extracted from an air delivery conduit that communicates the mask and flow generator. 31. The CPAP system of claim 1, wherein the return line is not provided with a negative pressure source. 32. A continuous positive airway pressure (CPAP) system comprising: a mask for a patient, the mask including a breathing chamber;a flow generator in communication with the mask;a positive pressure line to provide positive pressure air from the flow generator to the mask; anda vacuum or return line provided to actively extract and/or remove gas exhausted by the patient,wherein the positive pressure line includes an air delivery tube, and the vacuum or return line includes a relatively smaller tube which is spirally wound around the perimeter of the air delivery tube. 33. A continuous positive airway pressure (CPAP) system comprising: a mark provided for a patient, the mask including a breathing chamber;a flow generator in communication with the mask;a positive pressure line to provide positive pressure air from the flow generator to the mask; anda vacuum or return line provided to actively extract and/or remove gas exhausted by the patient,wherein the vacuum or return line is in communication with a vent outlet provided on the flow generator. 34. The CPAP system of claim 33, further comprising a noise reducing device or muffler within the flow generator provided between the vent outlet and the return or vacuum line.