HEPA Pure Filter: Eliminates 99.9% of pollutants as small as 0.1 micron so you can breathe easy. Perfect for bedrooms, living rooms and home offices. Ideal for asthma, and other concerns. Powerful Air Purification: The Alen BreatheSmart 75i is essential for large spaces up to 2800 sq ft. High-efficiency fan handles toughest contaminants, making it ideal for your home ensuring clean, fresh air throughout your space. Engineered to Perform: Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration. Medical-grade filters capture particles as small as 0.1 micron. Smart Air Purification: Elevate your home with Alen BreatheSmart 75i. Our SmartSensor adjusts fan speed based on air quality, with color-coded feedback. Purple to blue rings indicate air quality levels from excellent to high particle presence. Enhancing Sleep: The BreatheSmart 75i is proven by SleepScore Labs to enhance sleep according to a peer study. Its ultra-quiet operation emits pink noise, optimizing lower octave frequencies, and ensuring a restful night.