Home Oxygen Concentrators are considered stationary medical oxygen devices that are used for oxygen therapy. Even though most home oxygen concentrators come equipped with caster wheels, these wheels facilitate moving the concentrator from room to room within the home and are not considered portable outside of the home. Because of their large size and weight, home oxygen concentrators are often referred to as Stationary Oxygen Concentrators. For patients who suffer from emphysema, chronic obstructive pulmonary disease (COPD) or other related respiratory ailments, an oxygen concentrator is an essential item of home medical equipment. Many oxygen patients’ lives depend upon the support of their oxygen concentrator to meet their needs. Most Home Oxygen Concentrators offer continuous flow oxygen that is supplied to the respiratory patient without interruption, during both inhale and exhale cycles. Portable Oxygen Concentrators on the other hand, mostly use pulse flow oxygen rather than continuous oxygen because of their small size. Pulse dose is not continuous oxygen because it provides a puff of oxygen only during the inhale cycle. Home Oxygen Concentrators are usually much larger than portable concentrators and offer more oxygen flow. Many of these large O2 concentrators can also supply oxygen for up to 50 feet of oxygen tubing, allowing significant mobility to patients within their own home.