SIMPLE ONE-BUTTON CONTROL: Easily adjust fan as-needed with one button to ensure optimal air quality, including lowering fan speed at night for uninterrupted sleep CLEAN AIR IN MINUTES: Blueair's HEPASilent technology, delivers clean air, faster, and much more quietly than traditional HEPA filtration alone; Quickly cleans 540sqft large room in about 12.5 min or up to 2592sqft XL space in 60min, on high ONE OF THE QUIESTEST AIR PURIFIERS: Quieter (31 dB) than whisper on low; ENERGY STAR rated - uses less energy (30W) than an incandescent lightbulb on low COMBAT ALLERGENS: Helps reduce allergens and pollutants that trigger allergy and asthma symptoms REMOVES ODOR and PARTICLES DOWN TO 0.1 MICRON: Ideal for smoke and smog during wildfire season; Removes 99.97% of airborne particles like smoke, dust, viruses and pet dander, while the carbon filter traps light household odors from smoking, pets and cooking MOST AWARDED AIR PURIFIER BRAND IN THE US: Blue Pure 211 plus has won Goo