Shark is a name brand we trust, and we were not disappointed in this air purifier. I ran it for a month in our den, the room we spend the most time in. Our sinuses thank us! Not a spec of dust in the entire room since we've been running it. It's quiet enough to hear the tv with no problem. And it has a fan and a heater built in. We are looking forward to having purified heated air this winter since our last space heater died. I cannot recommend this purifier enough!