AirDoctor 3500 Showdown: HEPA Tests & 1260 sq ft Magic... Breathe Easy Now We’ve had the AirDoctor AD3500 in our own space for weeks now, and the difference in air quality is noticeable. The immediate purifying power of its UltraHEPA, Carbon, and VOC filters covers even the largest rooms up to 1260 sq. ft. Efficiently circulating air 2x per hour, we appreciate how quiet it runs while tackling particles 100x smaller than standard HEPA. The Air Quality Sensor is a neat touch, adjusting filtration as needed. Our tests showed significant reductions in pet dander and household pollutants. While some initial setup takes time, our experience shows it delivers on its promise of cleaner air. The 1260 sq. ft capability feels accurate, making it versatile for homes or shared spaces. Truly, breathing easier is now within reach.