Core 600S-RF-SR, 4-In-1 Filtration, Outer Pre-filter, Inter Pre-filter, An Efficient Filter, Effective Activated Carbon Filter Notes: *Choose from a variety of replacement filters to best meet your needs. The Toxin Absorber Filter specializes in smog, toxins, and VOCs, while the Smoke Remover filter addresses smoke from wildfires, smoke, and other particulates. The Pet Allergy Filter captures fur and absorbs unpleasant odors.