DeVilbiss Oxygen Concentrator is the smallest size home oxygen concentrator on the market. That makes the DeVilbiss Concentrator easier to transfer from room to room. The small size of this concentrator makes it less obtrusive in the home and produces an oxygen output of 5 liters per minute (LPM). Containing a recessed humidifier nook, this home oxygen concentrator is equipped with a two-piece cabinet for ease of maintenance. The DeVilbiss Home Oxygen Concentrator is feature rich and comes at a low price, making it our best selling home oxygen machine.