Uvonair 8" UV Inline Duct Ozonator - 2 Bulb Ozone safely alters the molecular structure of offensive micro-organisms, to eliminate odor. UvonairŪ is an economical system that produces ozone using special ultra violet light bulbs. Ideal for rooms up to 5000-10000 cu.ft. (150-300m3). Fits 8" (20 cm) ducts but can be installed into other size ducts using adapters. WARNING: FOR COMMERCIAL USE ONLY IN UNOCCUPIED AREAS.