Ultraviolet Germicidal Irradiation technology

Many of the air purifiers offered here on PureAirProducts.com can be equipped with optional UV filters based on Ultraviolet Germicidal Irradiation technology. This technology uses ultraviolet (UV) light at a very short wavelength to break down micro-organisms. The short wavelength of this UV light is virtually harmless to humans and pets and normally blocked by our atmosphere, but is extremely harmful to micro-organic life forms such as airborne pathogens, bacteria, viruses and mold. The light destroys nucleic acids within these organisms, damaging their DNA through UV radiation. This either permanently disrupts the ability to reproduce, or kills the organisms.

When used with a filtration system, UVGI can remove harmful micro-organisms from indoor environments. At specific wavelengths short range ultraviolet light (UVC) is mutagenic to bacteria, viruses and other pathogens, breaking down the molecular bonds that hold their DNA together either destroying them entirely, rendering them harmless or preventing growth and reproduction. The effect can be compared to the familiar effect that longer wavelength ultraviolet light (UVB) has on humans: Sunburn. Unlike humans micro-organisms have much less protection from UV light and cannot survive prolonged exposure to it without sustaining irreversible damage.

Germicidal UV is delivered by a mercury-vapor lamp that emits UV light at the required wavelength. Many bulbs use transformers to ensure even electrical flow to maintain a steady wavelength, Since the bandwidth of the UV light is so narrow any fluctuation in power can reduce its effectiveness. When used in closed environments such as duct systems germicidal UV is lethal to all micro-organisms over time. Generally speaking, the longer a micro-organism is exposed to UV the better the effect. With the aid of fans, many air purifiers circulate air repeatedly with the aid of fans to expose organisms to the UV light as often as possible. This is done to ensure the light is effective against even the more resistant micro-organisms, irradiating them more than once to break down their DNA.

Some side effects exist with UVGI technology. Since UV light is harmful to humans and animals at certain wavelengths most of today's units shield the UV bulbs and limit their exposure. Many units feature shut-off mechanisms which automatically turn off any UV light components should the unit be opened.
Prolonged exposure of the skin to germicidal UV light can produce sunburns and, in severe cases, skin cancer. Serious damage to the eyes can occur if exposed, such as cornea inflammations, retinal damage, temporary or even permanent vision impairment up to and including blindness.

Germicidal UV light produces a small amount of ozone as a by-product. Ozone occurs naturally in the Earth's stratosphere where it shields the planet from radiation, but at an atmospheric level ozone can be harmful to human health, with many people showing more pronounced sensitivity to ozone than others. The United States Environmental Protection Agency (EPA) considers .05 parts per million (ppm) of ozone in indoor air to be safe. Germicidal UV radiation is also capable of breaking down chemical bonds, such as in plastics, over time weakening materials. Taking into consideration that most electronic devices produce safe levels of ozone as a by-product, and PureAirProduct.com's dedication in bringing you products that improve indoor air quality all UVGI air purifiers offered on this site are safe to use in the home.

The UVGI technology has been used in the medical field for over a century. In 1903 Danish researcher Niels Finsen was awarded the Nobel Prize in Medicine for his pioneering use of UVGI against lupus, tuberculosis and other diseases. UVGI technology has been used in many other sterile work facilities, most prominently in water treatment plants to sterilize drinking and wastewater. Besides hospitals and laboratories using UVGI you will find barbershops, piercing studios, and tattoo parlors using forms of UVGI technology inside sterilization tanks to sterilize equipment that comes in contact with the human body. The food and beverage industry also makes use of UVGI technology to sterilize produce and in particular fresh fruit juices. In aquariums and ponds UVGI is used to inhibit the build-up of single-cell algae. UVGI technology has been proven to successfully clean indoor air, especially when used in conjunction with other air filtration systems such as HEPA or activated carbon purifiers. Choosing an air purifier with an optional UV filter will provide increased air cleaning capabilities and give you the added health benefits of cleaner air in your home.

A selection of our products using UVGI technology:




  Air Purifiers
  Portable Air Purifiers
Whole House Air Purifiers
Replacement Filters
Room Air Purifiers
  Portable Humidifiers
Room Humidifiers
  Air Circulation Fans
Ceiling Fans
  Bathroom Fans
Ceiling Mounted
Fan Only
Fans with Light
Fans with Heaters
Decorative Fans
Humidity Sensor
Remote Inline
Wall Mounted
Kickspace Heater
Passive Inlet
Timers and Controls
Energy Star®
Bathroom Ducting Accessories
  Range Hoods
  Wall Mount
Island Range Hoods
Under Cabinet
Ventilator Power Packs
Range Hood Accessories
Remote Blowers
On Sale
  Dryer Booster Fans
  Dryer Booster Fans
  Utility Fans
  Wall Mounted Inline
Furnace Boosters
Kickspace Heaters
On Sale
  Whole House Fans
  CVS Inline Fans
Air Exchangers
Attic Fans
  Other EefaCo Stores


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