Dryspell medical dryers or Breathing Air Systems delivers a dewpoint of +2°C as mandated by NFPA 99. The dryspell medical dryers operates in the principle of pressure swing adsorption, hence removes more moisture than a refrigeration air dryers, and it delivers moisture free dry air consistently irrespective of flow variation. Based on medical application criticality, the package comes with one working and one stand by dryers. So there is no need to stop the air dryers for maintenance. Optional purge saving system saves purge air upto 60% for a typical hospital load of 30% to 40%. Optional dewpoint and Co monitor enables to monitor dewpoint and Co levels as mandated by NFPA 99.