Air cleaners operate by mechanical filtration, absorption, adsorption, or electrostatic precipitation of pollutants to reduce exposure to indoor and outdoor pollution. Extended surface pleated filters serve the most effectively and will be the most useful over the widest range of pollutant types. These filters are available as stand-alone units, as add-ons, or as in-lines for most home systems. Filter size and efficiency vary.
Negative ion generators can be effective air cleaners. Negative ion generators emit negative charged ions which attach to airborne particles, which then attach themselves to room surfaces removing them from the air. These particles, however, are potentially subject to re-suspension and should be removed with high efficiency particulate air vacuum cleaners. Although some advertisers' claims regarding effectiveness and health benefits have not been verified, this method is considered moderately effective at reducing particulate levels.
Electrostatic air precipitators are an effective air cleaning method to reduce indoor particulates. These units operate by putting an electrical charge on particulates and then removing them from the air by attracting them to an oppositely charged plate. These units are available for installation in the duct of a forced ventilation system or as independent units. Electrostatic precipitators and negative ion generators may produce ozone, a potential respiratory irritant. However, the amount of ozone produced is usually quite small.
Activated carbon and specialty filters with adsorbents are available for the removal of gaseous contaminants. This method of filtration can be quite effective; however, sizing and maintaining this type of filtration system can be complicated. Contact your air condition system contractor for specific applications.
After choosing the right filter and it’s properly installed. Good maintenance practice is essential. There is growing research work documenting how loaded filter in a ventilation system can have adverse impact on perceived air quality, sick building syndrome symptoms, and performance of office work. They can be inhabitant for chemical and biological contaminants.
For more information on indoor air quality, please visit http://www.iaqsg.com
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