The 3250I Blue Max Air Purifier with HEPA Silent technology purifies rooms up to 48m2 in 30 minutes on high settings. It effectively removes at least 99.97% of airborne particles through its dual filtration system, which combines two technologies. Blueair's HEPASilent™ dual filtration technology delivers up to 45% more clean air faster, using less noise and energy compared to traditional HEPA filtration alone. This refurbished model offers enhanced HEPASilent performance, providing up to 83% faster cleaning and 50% less noise.