Air purifiers can use a variety of technologies to reduce indoor pollution. Certain models are more effective than others. Some are harmful to your health.
Models that incorporate mechanical filters
This is the way CR tests
Pleated filters are air purifiers that make use of fans to push air through fine fibres. They trap particles. Filters made of very fine meshes are HEPA filters that are that are certified to catch 99.97 percent of particles that are of an x-size. HEPA filters can remove larger particles which include pollen, dust, and some mold spores, while they're suspended in the air.
Modular models that incorporate activated carbon filters
Rather than catch particles like mechanical filters, sorbent filters use activated carbon which can be used to capture certain molecules that cause odor from the air. They can also combat certain gasses, however they're particularly effective against formaldehyde ammonia or nitrogen oxide. Many air purifiers have an activated and pleated carbon filter to catch particles. Activated carbon becomes saturated more quickly than pleated filters however, it requires replacement more frequently , every three months as opposed to every six or 12 months for pleated filters. It is recommended to budget for replacements: Activated carbon filters can cost up to $50 for each. To discover more details about Air Cleaner honest review, you have to visit our website.
Ozone generators
These machines can create ozone, which is the molecule that reacts to certain pollutants, thereby altering their chemical makeup. This could result in hazardous indoor air quality and CR does not recommend these types of home air cleaner. Ozone generator manufacturers often claim that the devices emit safe levels of ozone, but in the past, our tests showed that, even at lower settings, some ozone generators quickly exceeded the Food and Drug Administration's maximum of 0.05 parts per million for medical devices. The EPA reviewed studies that showed that ozone levels in the low range, which is the principal component of smog, do not effectively remove indoor pollutants. Studies have also shown that ozone can cause a decrease in lung function and irritation to the throat, pain in the chest and lung tissue and coughing. Ozone exposure can also worsen asthma, emphysema, and bronchitis.
Electronic air purifiers
Electrostatic precipitators and ionizers are devices that charge particles in the air by charging them to the point they adhere to plates or other surfaces nearby. Since they generate ozone CR is not recommended to use or evaluate electronic purifiers.
Ultraviolet germicidal irradiation (UVGI)
Some companies claim their air purifiers kill airborne bacteria, viruses and fungal spores using UV lamps. However, certain mold and bacteria spores can't withstand UV radiation. To ensure UVGI air purifiers that are efficient they must be able to emit UV radiation should be strong enough. The duration of the exposure should be for at minimum 30 minutes. CR doesn't test UVGI technology, though certain mechanical air purifiers that we test may have the purpose.
Photocatalytic oxidation
PCO uses ultraviolet radiation, as well as a photocatalyst such titanium dioxide to create radicals called hydroxyl that convert gaseous pollutant. This reaction can produce harmful byproducts depending on the pollution. At present, CR doesn't test PCO technology. There have been few field investigations done regarding the efficacy of PCO purifiers for air, however the results of a laboratory study carried out by researchers from Syracuse University in New York found that the devices could not effectively remove any of the VOCs commonly found in indoor air.
The manufacturer recently introduced the possibility of a new version of PCO named PECO. The purifier's air quality failed in tests of pollen, smoke and dust elimination.
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