The Lennox PureAir and PureAir S are whole-home air purification systems that integrate directly with your central HVAC ductwork. They utilize hospital-grade MERV 16 filtration, UVA light, and photocatalytic oxidation (PCO) to eliminate 99.9% of dust, pollen, and pet dander, while destroying 90% of airborne viruses and neutralizing household odors. It can be attached to the side of the furnace for air filter size 20×25×4.