AllerAir air purifiers use a five-stage filtration process:

- A pre-filter to capture large particles:

- A medical grade HEPA filter traps 99.97% of airborne particles 0.3 microns in size

- An activated carbon filter with pounds of granular carbon to filter out chemicals, gases and odors

- Two anti-microbial filters

Activated Carbon and HEPA Air Purifiers
Activated carbon is among the most effective materials known today for treating airborne chemicals, gases and odor. It's used widely by the military, hospitals, scientific and industrial facilities, and disaster response units for its safe and powerful adsorbing properties.

To be truly efficient, activated carbon filters need to provide enough dwell time for pollutants to be adsorbed. This means that larger, deeper bed carbon filters will adsorb more airborne pollutants.

When used in combination, activated carbon filters and HEPA filters (high efficiency particle filters), offer the most comprehensive air purification available to treat airborne particles, chemicals, gases and odor.

Air purifiers and air cleaners with this technology are especially suited for allergy relief, asthma prevention, multiple chemical sensitivity, cigar and cigarette odor removal, pet odor removal, newborn baby health and general home and office use.

HEPA Filtration in Air Purifiers
HEPA is an acronym for "high efficiency particulate air". This type of air filter can remove at least 99.97% of all airborne particles 0.3 microns in size (the most difficult to filter). Particles that are larger or smaller are generally filtered with even greater efficiency in most air purifiers.

Ultraviolet Light in Air Purifiers
Ultraviolet light is a proven technology used for sterilizing both air and water. It is widely used in air purifiers for the medical industry to neutralize airborne tuberculosis, cold and flu viruses, smallpox, anthrax, and other airborne diseases and bacteria. UV used in indoor air purifiers has also proven effective against airborne mold mycotoxins, animal dander, cat saliva, dust mites, and pollen.

UV germicidal sterilization in air purifiers works by breaking down microorganisms and disrupting their DNA, making them unable to reproduce and in effect, "killing" or neutralizing them.

In most air purifiers, UV has a cumulative effect, meaning that the more times the air passes through the unit the better the "killing" rate for microorganisms. For air purifiers used in medical, food and residential sterilization, we recommend continuous operation at low speed for the most comprehensive results.

Photocatalytic Technology in Air Purifiers
Photocatalytic air purification technology uses UV light and a special catalyst to destroy volatile organic compounds, hazardous chemicals and harsh odors. Photocatalytic technology as used in air purifiers is considered revolutionary. Like no other medium, it can actually break down and destroy dangerous and previously hard to treat pollutants including halogenated organics and pesticides. Several AllerAir air purifiers now offer photocatalytic technology. Contact an indoor air quality representative for more information.