What are the different types of Filters in an Air Purifier? 31 August 2018

The quality of the air we breathe affects our health and well-being, and that includes not just outdoor air but also indoor air. One of the biggest trouble-makers is dust. More specifically, dust mites, which are microscopic bugs that feed off of house dust and the moisture in the air and cause dust allergies. Fortunately, there are many different air purifiers on the market that can effectively filter out microscopic organisms, including dust mites, and significantly improve the quality of your life. To choose the best air purifier for your needs, you should understand the differences between the most common types of air filters found inside modern air purifiers.

Definition
Benefit
Benefit
Reference

HEPA Filters

Definition

High-Efficiency Particulate Air (HEPA) filters are composed of a mat of randomly arranged fibers, and they can remove 99.97 percent of particles that are at least 0.3 micrometers large from the air.

Benefit

The ability of True HEPA filters to remove pollen, hair, dust, mold spores, and other air pollutants makes them great for allergy relief, asthma support, and healthier living in general

Benefit

In the United States and in most other developed countries, HEPA filters must remove at least 99.97 percent of airborne particles 0.3 micrometers in diameter to qualify as True HEPA

Reference

A good example of a True HEPA air purifier is the HPA300 from Honeywell, which is suitable for rooms that are up to 465 sq. ft. large.

Carbon Filters

Definition

Carbon filters use a process where the pollutants adhere to the carbon particles as the water or air passes through it.

Benefit

Carbon filters absorb chemicals and gases from the air, including such volatile organic compounds (VOCs) as formaldehyde and paint fumes.

Benefit

The thicker the carbon filter the better the adsorption. If the pollutant has to go through a long maze of activated carbon, it’s chances are better of being adsorbed.

Reference

For Example, the Blue Pure 411 Air Purifier features a carbon filter which catches virtually every airborne contaminant: pollen, dust, pet dander, mold spores, smoke, allergens and bacteria

Pre-Filters

Definition

The pre-filter is the front line in an air purifier, and it captures largest particles which the primary filter usually can’t do.

Benefit

The oxygen in these filters creates openings to pull odors, gases and vapors. Those that contain the chemical chemisorbent can also pull VOCs

Benefit

Pre-filters act as the first line of defense against air pollutants -hence they typically need to be replaced more often than HEPA or carbon filters.

Reference

For example, the Levoit LV-PUR131 combines a pre-filter with a True HEPA filter and a carbon filter.

Ionic Filters

Definition

An air ioniser  is a device that uses high voltage to ionise  air molecules. Particles that are present in the air are attracted to these ions, which causes deionization to occur, making the particles land on floors, walls, and furniture.

Benefit

Ionic filters are most commonly found in the commercial sector, where they reduce the number of pollutants in the air by producing negatively charged ions.

Benefit

Ionic filters are effective against viruses, allergens, and various other irritants as small as 0.01 micrometers.

Reference

For Example, the Envion Ionic Pro Turbo Ionic Air Purifier is reduces allergens, germs and other airborne pollutants, then emits purified, invigorated air

UV Filters

Definition

Ultraviolet air purifiers are a new form of technology intended to substantially improve air quality and remove detrimental microbial particles that may be present in the air.

Benefit

UV filters destroy microorganisms, such as bacteria and mold, using ultraviolet light, which is electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays.

Benefit

UV filters are not effective against solids in the air, including dust and other allergens. They can be found in medical facilities alongside HEPA filters.

Reference

For Example, the GermGuardian AC4825 UV-C light technology works with Titanium Dioxide to reduce airborne bacteria, viruses, germs and mold spore

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