NOMA True HEPA Air Purifier Reusable Pre Filter, Removes Allergens & Odours, Replacement Filter For 043-7339

Have been running this for half the winter so far, to deal with particles from a woodstove, and other dust in an old house. I mainly use it after a smoky restart to my woodstove, or once a week. It's very quiet on low fan/good air - no problem sleeping in the same room, and probably OK on medium also. The difference in air quality is noticeable within 10 minutes of it being switched on. It must be effective with minor biological pollutants, as these cause me to sneeze even in very small quantities, and I have had no problems at all since installing this air purifier. I never need to run it for more than two hours, and haven't had to wash the prefilter yet. The quality ring light is no brighter than a nightlight, and does not stop me falling asleep. Highly recommended when on offer/clearance (cheaper than anywhere else, including online), and no need to get the bluetooth-enabled one. It's pretty light and easy to move about. I am using it in rooms slightly larger than the recommended maximum size with no problems. You might need to stick to the guidelines in a city, but for clean outside air/rural use it seems OK to use in larger than recommended rooms. The new bluetooth version uses the same filters (unlike some brands), so the spare filters should be available for a long time.