Air Purifier by Guardian Technologies. Improve your indoor air quality. This HEPAFresh air cleaning tower uses a multi-layer filter system to capture allergens and reduce household odours. The all-in-one filter is simple to replace when needed. HEPAFresh filter captures 99% of airborne particles, such as dust mites, debris, mold spores, pollen and pet dander. The charcoal filter layer captures household odours. The pre-filter extends the life of the HEPAFresh filter by capturing large particles, lint, and pet hair. The CADR (Clean Air Delivery Rate) displayed on the product carton may not match the ratings on our website. Please refer to the manufacturer website for the most accurate ratings. In an effort to stay up to date with Version 2.0 testing requirements, CADR ratings on the manufacturers website reflect the test results of product manufactured after 10.16.20.