Disclosed is an oxygen and air delivery system 100, enabling oxygen and air delivery through tracheal tube or mask. The system comprises a Y tube, wherein the oxygen passes to one end of Y tube, other end of Y tube receives air from an air delivery unit 102, and a mixture of air and oxygen passes through third end of Y tube 105b to an oxygen sensor 111. An oxygen delivery measuring unit 103 is configured to read the percentage of oxygen delivered. A manometer adjusts pressure in the system 100. A respiratory rate monitor 106 configured to monitor number of breaths and an end respiratory adjustment unit 107 for adjusting the end respiratory pressure. The system 100 does not contain valves and can work during power failure. The pressure management in the system 100 is performed by blowing off the excess pressure in the system 100 to the atmosphere.
