Airfree P1000 Filterless Air Purifier Recommended room size: 450 ft. This product is CARB-certified With exclusive Patented Thermodynamic TSS Technology, Airfree applies the same concept as boiling water by using heat to destroy microorganisms and attains 100% efficiency at the Airfree air outlet. Airfree destroys mold, allergens, dust mites, bacteria, viruses, pollens, pet dender, tobacco, ozone and other organic pollutants. Filterless technology: No extra costs with replacement filters. It is completely silent.