HEPASilent of Blueair? Efficient and silent multilayer progressive filtration technology is a dual technology combining electronic adsorption and filter screen filtration, which can remove 0. 1 micron inhalable particles harmful to the lungs and allergens, cigarette smoke, bacteria and particles released by laser printers and fax machines. Our patented technology ensures Blueair to achieve "two lows and one high"-low wind resistance, low noise and high efficiency of indoor air purification system. Blueair exquisite materials and sophisticated technology, only 30 decibels at low speed, running very quietly.
U.S. PatentNo.: U.S. 6,364, 1, 9358L