Superb air purifier with amazing controls, quiet and very effective. Great look and the right size. Shifts from one speed to the next without noticeable motor effort. We had a huge number of fires this summer in our area, with choking smoke and floating debris. The Alen BreatheSmart FLEX did the most amazing job in keeping our home livable with purified indoor air. Our one question is: When is Alen going to make a great electric heater along the lines of their fabulous air purifier? The need is out there and if Alen could turn their attention to building an effective and high quality heater, people would buy it.