FreshAir Respiratory Care Inc. Home Oxygen and Sleep Study. More and more people are using oxygen therapy outside the hospital, permitting them to lead active, productive lives. People with asthma, emphysema, chronic bronchitis, occupational lung disease, lung cancer, cystic fibrosis, or congestive heart failure may use oxygen therapy at home. Let FreshAir Respiratory Care Inc. help you with your oxygen needs and other related Respiratory products and services. Our oxygen tank duration app will closely estimate how much time you have in your oxygen tank based on your flow settings.