Our HEPA filter replacement is a great starter filter option that is compatible with the Aeris Aair 3-in-1 Pro Air Purifier. With Filter-Monster we're offering three different filter options to fit your needs - from home, office, or industrial areas. Filter-Monster gives you more than a filter—it gives you cleaner air, reliable quality, and real savings. Model AS-4816163-FM1: Model AS-4816164-FM1: Model AS-4816165-FM1: What You Get: One (1) replacement filter Filter Size