The Alen BreatheSmart Flex is ideal for kids rooms, home offices, home gyms, and other rooms up 700 sq. ft. Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration technology to deliver and maximize airflow while minimizing noise. Our H13 medical-grade filters capture particles as small as 0.1 microns, removing even the tiniest pollutants including dust, pollen, pet dander, mold spores, germs and bacteria, and more. Alen purifiers are backed by the industry s only Forever Guarantee.