【Upgraded 4-Stage Filtration System】Compared with the 3-stage filtration system of other brands, Bulex air purifier upgrades to 4-stage filtration system, including Pre-Filter, True HEPA Filter, Actived Carbon Filter, and Net Filter. It filters particles as small as 0.3 microns, removes 99. 97% of airborne particles, totally refresh air quality around you. 【Large Space of Air Purification】Bulex hepa air purifier can clean air of up to 404ft² in 30 minutes, 808ft² in one hour, very ideal to put this air cleaner to home, bedroom, office, etc. With Patented true HEPA Filter, Bulex HEPA filter folds 161 times in order to triple expand normal HEPA filtration area, extending the lifespan of filter. 【Multi-function Touch Panel】Customized 4-speed fan & 3 timer setting allows circulating room air over 4 times per hour to achieve rapid 【Tested and Certified Quality】Bulex air purifier is fully approved by Coverage Area: 404ft2 4 Fan Speed Rated Power: 45W Weight: 5.57lb