The AirPhysio Average Lung Capacity device is a drug free device designed for most teenagers and adults who don't have any severe lung conditions looking to improve their quality of life easily and without drugs and medication. The 1# Mucus Clearance And Lung Expansive Device To Naturally Improve Your Breathing. The device works to reduce breathlessness, especially for those complaining of short breath. It is approved by FDA as one of the best solutions to shortness of breath and a great exercise to develop a better breathing.