LEVOIT Air Purifiers for Home Large Room Up to 1900 Ft² in 1 Hr with Washable Filters, Air Quality Monitor, Smart WiFi, H13 True HEPA Filter Removes 99.97% of Allergy, Pet Hair in Bedroom, Vital 200S

I know how well it is working by the amount of dust (etc) that is quickly accumulating on the pre-filter. The very fine and large, pre-filter is sturdy and very easy to remove and clean.

Using it in my office. My secretary would start coughing every afternoon and felt it was because of the poor air quality. This air purifier seems to be working at cleaning the air. She feels better and her cough is gone,

This is nearly silent. And has greatly improved the air quality in our home....and we have three dogs.the

It took one day for this powerful purifier to clear the air in our home. The features on the machine, especially in app are impressive and exceeded expectations.