Don't let the size fool you, this machine produces more ozone than machines 3 times its size. Eliminates smoke, pet odors, mold, mildew & more. 2.65 grams/hr. 7.95 p.p.m. Effective for areas up to 40,000 cubic ft. 30-hr programmable timer with adjustable output levels. Power supply overload protection. Tested and proven to maintain proper activated oxygen levels. High-density ceramic and stainless steel electrodes. No plates or UV tubes to maintain. Two-year limited warranty on parts and lifetime warranty on ozone electrodes.