Pentex Ionic Air Cleaners: This is the only air ionizer to be selected for use in studies at three renowned University Hospitals, resulting in the benefits being published in prestigious medical journals and featured on CBS AND NBC WORLD NEWS. BENEFITS: Ionization increases oxygen intake. Ionization increases your vital lung capacity. Ionization raises the neuro-hormone Serotonin, which has been shown to improve the moods, energy and reduce insomnia. Ionization improves the cilia beat of lungs, which improves mucous flow, reducing thick and viscous mucous congestion. Ionization will reduce the incidence of colds, cross-infections and flu while promoting improved immunity. Pentex ion generators restore fresh, invigorating air to an enclosed environment by continually replenishing negative ions. Negative Ions, natures own air purifier and emotional stabilizer, are created by nature through means of wind, sunlight, surf, waterfalls and rainstorms. A negative ion is an electrically charged atom or molecule. Negative ions remove pollutants from the air by colliding with various airborne particles. The negative ions give up their negative charge to that particle. These newly negative-charged particles then attract the positive particles surrounding them, accumulating enough particles until they become too heavy and fall to the floor. Pentex VI - 2500 - Designed for large office and hospital space, the VI 2500 is an ultra compact air purification unit that covers large areas. Up to 800 sq. ft.! This unit was tested in numerous university tests and out performed it's largest commercial competitor in every way. It actually cut employee sick days by 61% in just a few weeks. This unit works effectively to protect you from polluted air by removing dust, pollen, soot, smoke, and bacteria. Increases your oxygen uptake and improve energy. Size: 6 1/2" W x "7 1/2"Lx3"H. Ion Output 450 trillion ions/sec. cm2 at 2.5 cm. Coverage: 800 sq.ft., or •approx. 28.x28 ft. room. Weight: 2 lbs. Ozone Output: No detectable ozone. Particle Removal Effectiveness: as small as .01 micron*. Power: 110 AC outlet, 6watt, Purified Airflow Output: Greater than 100 ft. per min. *~Measured with Miniram Monitor type PDM-2 (serial #2028). GCA Corp. Environmental Instruments Technology Division. ~Measured with Dwyer Air Flow Vanometer, Model 50, (Covers 28'x28' room. approx 800 ft.), No noise, no filters to change, no moving parts. Pentex VI - 2000 - Perfect for home or office use, the Pentex Air Purifier is an ultra compact air purification unit. This unit was tested at Columbia University, Dept of Psych iatry, Boston, and at Rush St. Lukes Presbyterian Hospital, Chicago and shown to reduce depression in SADD (Seasonal Affected Depression Disorder) patients from 58% to 80%. The results of the study were aired on CBS World News, and NBC Ionizers are mood elevators with, or without depression. This unit works effectively to protect you from polluted air by removing dust, pollen, soot, smoke, and bacteria. Increases your oxygen uptake and improve energy. Covers approximately 400 square feet. Size: 6 1/2" W x "7 1/2"Lx3"H. Ion Output 70 trillion ions/sec. cm2 at 2.5 cm, Coverage: 400 sq.ft., or 20x20 ft. room. Weight: 2 lbs. Ozone Output: not measurable (well below OSHA stand). Particle Removal Effectiveness: as small as.01, micron*. Power: 110 AC outlet, 6watt, Purified Airflow Output: Greater than 100 ft. per min. *~Measured with Miniram Monitor type PDM-2 (serial #2028). GCA Corp. Environmental Instruments Technology Division. ~Measured with Dwyer Air Flow Vanometer, Model 50, (Covers 20'x20'). No noise, no filters to change, no moving parts. Pentex BioGuard 1000 - The miniature, advanced personal air purifier that protects the air you breathe wherever you go and it fits in your breast pocket. It provides you with a personal supply of negative ions anywhere you travel. Shown in University of California, Dept. of Microbiology and Molecular Genetics to remove 95% + of bacteria and chemical pollution around the wearer. This unit is especially helpful in cars, hotels, and on airplanes where you are very likely to breathe air of poor quality. It runs on one photo cel battery for 50 hours. Neck cord included. Size: 2.4" x 4.1"L x .86"D, Purified Airflow Output: Greater than 100 ft. p.m. 90 Day warranty