The Alen BreatheSmart 75i is Alen's most powerful unit, capturing the largest numbers of particles in your air in the shortest amount of time. The 75i is ideal for living rooms, open concept spaces, and other large rooms up to 1,300 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 medical-grade filters capture particles as small as 0.1 micron, removing even the tiniest pollutants including dust, pollen, pet dander, mold spores, germs and bacteria, and more. Laser sensor technology detects when particles are present and auto-adjusts fan speed, so you don’t have to. The 5 color coded rings show your indoor air quality at a glance and let you see how Alen is working to clean the air quickly and efficiently. Get real time air quality insights, view historical trends, or control your purifier remotely using the Alen Air app. Alen purifiers are backed by the industry’s only Forever Guarantee.