Ozone safely alters the molecular structure of offensive micro-organisms to eliminate odor. Uvonair? is an economical system that produces ozone using special ultra-violet light bulbs. Ideal for rooms up to 5000-10000 cu ft (150-300 m?). Fits 8 in (20 cm) ducts, but can be installed into other size ducts using adapters. Warning: For commercial use only in unoccupied areas. 6 month warranty on bulb.