Healthy Climate® PureAir™ Air Purification System Cleans the air in the home better than any other single system The PureAir™ system attacks all three classes of contaminants, providing a healthier home environment: Particles: small breathable particles such as pollen, dust and pet dander Bioaerosols and microorganisms: viruses, dust mites, bacteria, mold spores and fungi Odors and chemical vapors: pet odors, cooking smells, cleaning supplies and paints The annual maintenance kit for PCO20-28 includes the following: 1 - X8788: Healthy Climate® MERV 16 pleated filter 1 - PCO insert 2 - UVA lamps