Air Filtering


The air on Earth is a mixture of gases, suspended solids, and biological forms. The gas mixture is primarily nitrogen and oxygen. A very small portion of the gases are argon, an unreactive gas. An even smaller portion is carbon dioxide, a by-product of biological organisms and human activities.

The suspended solids include soot, soil, pollen, mold, bacteria, viruses, and various other materials that can be harmful. A variety of methods have been developed to make the air easier to breathe by filtering out the suspended solids. Air filtering aims to remove solid contaminants in the air.

How air filters work


Air filtering is a simple and straightforward process. Air is forced through a mat of fibers which are packed tightly enough to trap miniscule particles, but not so tightly that air cannot pass. Particulate matter that collides with a fiber will stick to the fiber, meaning that when the air comes out of the other side of the filter, any particles that collided with a fiber will be left behind.

This air cleaning system can be incredibly effective. HEPA filters remove at least 99.97% of particulate matter that is 0.3 microns in diameter. For particles larger or smaller than 0.3 microns, HEPA filters remove more than 99.97% of the particles. That means for every 3,000 particles that enter a HEPA filter, less than one makes it through.

One drawback of fiber filtering is the need to change the filter periodically. This can prove expensive over time, and if there are no spare filters on hand the risk of running an air filter with a dirty filter is increased. Also, if there is sufficient moisture in the system, mold and bacteria can grow in the filter medium, posing potential health risks until the filter is swapped out.

Electrostatic filters dispense with the need to replace physical filters by imparting an electric charge to incoming air. The particles in the air are then attracted to an oppositely charged plate, or to the surrounding environment. The plates can be cleaned and reused, meaning that the problem of replacing a filter is avoided.

The fibrous and electrostatic filters take care of solid pollutants, but as far as removing volatile organic compounds goes, other steps are required. Activated carbon is specially processed carbon, often charcoal, that has a very large surface area. Volatile organic compounds readily adhere to the surface of the activated carbon. This process, called adsorption, differs from absorption in that the molecules only stick to the surface of the solid carbon instead of absorbing into the body. Air purifiers with carbon filters include an activated carbon layer that captures gaseous and suspended liquid pollutants from the air.

SoClean 3-Stage Air Purifier+

Shop Now

Other considerations


Air filters can only filter the air that passes through them. This is why it is recommended to place multiple air filters throughout a home. An alternative arrangement for air filtering an entire home is to place the filter within the HVAC system. The air filter can be placed between the intake of outdoor air and the rest of the system, and can also be placed in a recirculation line to help filter already conditioned air.

In the close quarters of a hospital ward, an infection can quickly move from patient to patient. Transmission of airborne diseases between patients in hospitals can be reduced by ensuring that air delivered to different rooms has been through an air filtration system.1

More Products from SoClean


                
                  SoClean Air Purifier+ Filter Kit

SoClean Air Purifier+ Filter Kit

Advanced filtration replacements and accessories to enhance your EcoSystem Of Clean™.

$68.95

Learn More

                
                  SoClean Face Mask 3-Pack: Adult/Regular Size: Grey/Black/Blue

SoClean Face Mask 3-Pack: Adult/Regular Size: Grey/Black/Blue

Save $26!

Breathe easy. We’ve got you covered.

Not all masks are created equal. You need one that not only looks great, but works overtime to create a highly effective barrier between you and airborne viruses. And, with its soft cotton construction you can count on long-wearing comfort.

  • Other Sizes and Colors are also available.
  • Optimized for breathability with moisture-wicking, cotton fabric
  • Lightweight, bendable nose wire to help keep glasses from fogging up
  • Adjustable ear loops to comfortably secure mask
  • Reusable and machine-washable for easy care

$13

Learn More

                
                  SoClean Air Purifier Filters 3-Pack

SoClean Air Purifier Filters 3-Pack

8 months of filter life!

Get all the replacement filters you need to keep your SoClean Air Purifier running for the next 8 months.

This kit includes: 2 Pre-Filters (each lasts 4 months) and 1 Core Filter (lasts 8 months).

$47

Learn More

FAQs

Fiber-based air filtration systems are designed to work as efficiently as possible; however, there is a restriction in airflow as air passes through the filter medium. The HEPA filter standard puts limits on how much a HEPA filter can restrict air. Electrostatic filters, which use an electric charge to cause particles to adhere to charged metal plates, cause a much lower drop in air pressure than fibrous media filters.

That’s all the stuff that was in the air and could have ended up in your lungs! Air filtering works best with a clean filter, so make sure to replace or clean the filter regularly, according to the manufacturer's guidelines. When the filter gets dirty, optimal airflow is restricted. This leads to a slowdown in the amount of air that can make it through, and less air can be processed.

Price alone doesn’t determine how well an air filter works. Look for independent research or testing for a given model before purchasing an air filter, air purifier or air cleaner.

Air filters designed to the HEPA standard are very effective at reducing the number of airborne particles. The HEPA designation requires that at least 99.97% of particulate matter that is 0.3 microns in diameter (PM0.3) be removed by the filter. Significantly, HEPA filters are more effective at removing particulate matter that is larger or smaller than this size. This means that for particles smaller and larger than 0.3 microns in diameter, HEPA filters remove more than 99.97% of the particulate matter.

Air filters can only filter the air that manages to pass through the filter. As particles start to accumulate on the filter, air flow is reduced, meaning that less air is processed. This makes the air filtering less effective.

More Products from SoClean


                
                  SoClean O₃ Smarthome Cleaning System™

SoClean O₃ Smarthome Cleaning System™

Save $140!

Refresh yourself … and everything else in your home.

The SoClean Device Disinfector and PowerWipe work together to create a natural cleaning system for high-touch items, using safe and effective Activated Oxygen.

$99

Learn More

                
                  SoClean 3 - Try it Risk Free!

SoClean 3 - Try it Risk Free!

The fastest, easiest, and most effective system for sleep equipment maintenance. Without disassembly, without water, without chemicals — without worry.

$348

Learn More

                
                  SoClean Hand Sanitizer Spray: Variety 2-Pack

SoClean Hand Sanitizer Spray: Variety 2-Pack

Save $21!

Summer can get dirty. Save on protection and peace of mind!

$15

Learn More

Why SoClean


Keep your home fresh and SoClean with the SoClean 3-Stage Air Purifier+. Up to 3,000 times more efficient than HEPA standards, the SoClean 3-Stage Air Purifier+ captures particles down to 10 nanometers and generates cleanroom-level clean air for your home. The easy-to-use design makes it simple to produce quality air wherever you are.

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


Sources:

  1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5077726/