Electric Air Cleaner


How can electricity clear the air of contaminants? There are two general methods by which an electric air cleaner can use electricity to do this. The simplest way is by providing power for a fan that drives air through a filter. In this arrangement, the actual air purification is done by a filter, and the electricity is simply providing power to the fan. Electricity can also be used to power a number of other technologies that can purify the air. Alternatively, the specific properties of electric charges can be used to cause contaminants to fall out of the air. The term “electric air cleaner” can be used to refer to any of these methods.1

Many methods of air purification can use electricity in their operations. In theory, an air filtration system that uses a fan to push air through a filter could use any source of power for the fan, but for residential air purifiers the source of power is always electricity.

Using UV Light


Ultraviolet germicidal irradiation (UVGI) air cleaners use UV light to damage or kill airborne pathogens, rendering them harmless. A high-intensity UV lamp irradiates air that passes through the electric air cleaner, which keeps the potentially harmful UV light away from any occupants of the space. One drawback of UVGI air cleaners is that they do not remove particulate matter or volatile organic compounds from the air.

Photocatalytic oxidation (PCO) combines UV light and a catalyst like titanium dioxide to oxidize gaseous contaminants into harmless components. Electricity powers the fan and the UV light. PCO air purifiers are only designed to reduce the amount of volatile organic compounds in the air. PCO electric air cleaners are not effective at removing airborne particulate matter, such as pollen and pet dander.

Each method has a different level of efficacy for different air pollutants. UVGI electric air cleaners make for effective air purifiers for bacteria control, but are ineffective at reducing the amount of airborne particulate matter. PCO, or photocatalytic oxidation, can reduce the amount of volatile organic compounds in the air to be an effective air purifier for chemicals, but doesn’t remove airborne particulate. A HEPA or ULPA fiber filter, when combined with an activated carbon filter, can be an effective air purifier for dust, bacteria, mold, and chemicals.

SoClean 3-Stage Air Purifier+

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Using Electric Charges


Some electric air cleaner designs use electric charges to remove contaminants from the air. Electrostatic precipitators and ionizers add a charge to particles in the air so that they will be attracted to surfaces with the opposite charge. Electrostatic precipitators include an oppositely-charged metal surface within the air purifier itself, sometimes integrated into a filter medium for increased efficacy. Ionizers release the charged particles into the surrounding area with the assumption that they will quickly become attracted to nearby surfaces. Both are effective at removing particulates from the air.

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Power Usage

An electric air cleaner uses enough energy that this usage should be taken into account when purchasing an air purifier for home use. In fact, an air purifier can use as much energy as a refrigerator.2 When choosing an air purifier, make sure to get the correct size. Too small, and the purifier won’t be able to clear enough air to make a difference. Too large, and you will end up paying higher energy bills for a device that could be used in a larger space.

FAQs

How long an air filter lasts depends on the design and how heavily the filter is used. Check the manufacturer’s guidelines to estimate how often an air filter will need to be replaced.

Not all air cleaners have filters that can be cleaned, so before trying to clean an air filter, check the manufacturer guidelines. If the filter cannot be cleaned, you will need to purchase replacement air filters. If the filter is cleanable, only use pure water when cleaning the filter, and run the water in the opposite direction of normal air flow. Make sure the filter is dry before reinstalling, and if you notice any sort of mold or bacterial growth, dispose of the filter immediately.

Electrostatic air cleaners that use a collector plate system can be wiped with a damp cloth or moistened paper towel. Make sure the unit is unplugged, and never attempt to wash any part of an electrostatic air purifier other than the collector plates.

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Why SoClean


Get cleanroom quality clean air at home with the SoClean 3-Stage Air Purifier+. The SoClean Air Purifier+ captures 99.99999% of airborne viruses and bacteria. The SoClean 3-Stage Air Purifier greatly outperforms HEPA standards in a portable package that can be easily moved from place to place.

Master Air Purifier Sources:

Air quality sources:

https://pubs.acs.org/doi/abs/10.1021/acs.est.5b01236
https://www.smu.edu.sg/sites/default/files/economics/shea2014/presentation/pollution_talk_april_2014_ham2.pdf
https://www.airnow.gov/aqi/aqi-basics/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4484965/
https://www.sciencedirect.com/science/article/abs/pii/S0048969701007653
https://www.cfp.ca/content/57/8/881/tab-figures-datad1
https://ehp.niehs.nih.gov/doi/full/10.1289/ehp.1002255
https://www.gotopac.com/art-cr-iso-cleanroom-classifications
https://www.researchgate.net/publication/316472615_A_review_of_air_filtration_technologies_for_sustainable_and_healthy_building_ventilation
https://www.epa.gov/indoor-air-quality-iaq
https://www.airnow.gov/sites/default/files/2020-05/aqi-technical-assistance-document-sept2018.pdf
https://www.health.ny.gov/environmental/indoors/air/pmq_a.htm#:~:text=Exposure%20to%20fine%20particles%20can,as%20asthma%20and%20heart%20disease

Air purification/filtration process sources:

https://www.consumerreports.org/cro/air-purifiers/buying-guide/index.htm
https://www.epa.gov/sites/production/files/2018-07/documents/residential_air_cleaners_-_a_technical_summary_3rd_edition.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6272289/
https://link.springer.com/article/10.1007%2Fs100220100046
https://www.kompareit.com/homeandgarden/hvac-compare-central-air-cleaner-cost.html
https://www.chemviron.eu/products/activated-carbon/
https://www.who.int/occupational_health/publications/en/oehairbornedust3.pdf
https://academic.oup.com/jimb/article/32/7/319/5992784?login=true
https://www.cabotcorp.com/solutions/products-plus/activated-carbon
https://www.sciencedirect.com/science/article/abs/pii/S009167499970391X
https://www.tandfonline.com/doi/full/10.3109/02770903.2014.895011
https://www.ashrae.org/file%20library/about/position%20documents/filtration-and-air-cleaning-pd.pdf

HEPA, UPLA, and MERV filter sources:

https://pubmed.ncbi.nlm.nih.gov/16517004/
https://www.britannica.com/science/human-respiratory-system/The-mechanics-of-breathing
https://www.epa.gov/pm-pollution/particulate-matter-pm-basics
https://www.merriam-webster.com/dictionary/HEPA
https://www.standards.doe.gov/standards-documents/3000/3020-astd-2015
https://www.standards.doe.gov/standards-documents/3000/3020-astd-2015/@@images/file
https://www.sciencedirect.com/science/article/abs/pii/S0195670105005074
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1477932/
https://pediatrics.aappublications.org/content/127/1/93.short
https://www.tandfonline.com/doi/full/10.1080/02786820500191348
https://www.sciencedirect.com/science/article/abs/pii/0360128583900023
https://onlinelibrary.wiley.com/doi/abs/10.1002/ajim.4700270302
https://www.laboratory-supply.net/blog/difference-between-a-hepa-and-ulpa-filter/
https://www.sciencedirect.com/science/article/abs/pii/S0360132320305588
https://www.karger.com/Article/Abstract/151502
https://www.grainger.com/know-how/equipment-information/kh-what-is-merv-rating-air-filter-rating-chart
https://www3.epa.gov/ttn/catc/dir1/ff-hepa.pdf
https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating-1
ttp://gttlab.com/uploads/soft/161025/EN1822-5-2009Highefficiencyairfilters(EPA,HEPAandULPA)Part5Determiningtheefficiencyoffilterelements.pdf


Sources:

  1. https://www.epa.gov/sites/production/files/2018-07/documents/residential_air_cleaners_-_a_technical_summary_3rd_edition.pdf
  2. https://www.energystar.gov/products/appliances/air_purifiers_cleaners