Five-liter oxygen concentrator for delivery of supplemental oxygen to patients with chronic respiratory conditions including COPD, emphysema, and other hypoxic conditions. Designed for home care and long-term care use, this concentrator delivers a continuous flow of concentrated oxygen at prescribed flow rates, eliminating the need for oxygen tanks and reducing delivery logistics. Suitable for stationary use in patient rooms in skilled nursing facilities and home care environments. Durable, reliable construction supports long-term continuous operation. An essential piece of durable medical equipment for respiratory therapy programs and home health agencies providing oxygen therapy to patients requiring ongoing supplemental respiratory support.