The Lightweight EverFlo Oxygen Concentrator from Respironics is a stationary concentrator that delivers all of the features patients deserve in a respiratory aid. The patented design of the Respironics unit allows the EverFlo to minimize operating costs. The Respironics EverFlo is smaller, sleeker, lightweight and easy to store or transport, weighing only 31 lbs. The EverFlo is simple for patients to use worry free.