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A high-efficiency particulate air (HEPA) filter is a high-quality device that the Department of Energy (DOE) states must remove 99.97% of particulates from the air.

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Air purifiers improve the quality of indoor air by removing contaminants. These contaminants may be any airborne particles, such as dust, mold, bacteria, and pollen. HEPA filters must follow certain standards that the DOE sets.

Air purifiers may offer benefits that include:

  • Relief from some asthma symptoms: Removing air pollutants may relieve some asthma symptoms and cause a person to rely on an inhaler less often. However, a 2018 systematic review concluded there is no clear evidence showing this to be true.
  • Removal of harmful chemicals and odors: A 2015 study evaluated the effects of office workers after exposure to some chemical and odorous contaminants. The research found increased cognitive function and productivity with lower contaminant exposure.
  • Reduced risk of airborne diseases: There is conflicting evidence around whether air purification reduces the spread of airborne diseases. One 2020 review suggests that air purifiers may help control some diseases, including COVID-19, in settings such as dental clinics. However, other research suggests purifiers may result in further spreading.
  • Improve sleep: Being able to regulate breathing better is important for sleep quality. A 2020 study found older adults with insomnia and anxiety benefited from air purification, which led to better quality sleep.

As well as improving indoor air quality, a purifier may reduce dust and the buildup of mold by trapping the dust particles before they settle on surfaces. This means they may also benefit people with allergies such as allergic rhinitis.

Below is a list of some HEPA air purifiers for a person to consider, based on factors such as cost, dimensions, and special features.

Please note that the writer of this article has not tried these products. All information presented is purely research-based.

BlueAir HealthProtect 7770i

BlueAir claims this filter works well for extra-large rooms, as it covers up to 674 sq. ft and completely filters the air in 12 minutes, at a rate of about five times per hour. It is only available in white.

Other features of this model include the following:

  • compatibility with Amazon Alexa and Google Assistant
  • a noise level between 25 and 53 decibels (dB)
  • ability to capture particles as small as 0.1 microns
  • automatic filter change reminders
  • true HEPA filter

This product has an energy efficiency of 8–71 watts (W) and dimensions of:

  • height: 39 inches (in)
  • width: 18 in
  • depth: 17 in

At the time of publishing, the BlueAir HealthProtect 7770i is available to purchase online for around $850.

Winix A230

Winix claims its A230 air filter is appropriate for small or medium rooms covering 230 sq. ft. However, it is not compatible with apps such as Amazon Alexa or Google Assistant. This model is available in charcoal grey or white and charcoal grey.

Other features of the Winix A230 include:

  • a four-stage filtration process
  • true HEPA filter
  • a minimum noise level of 25 dB
  • smart sensor that adjusts filtration automatically

This air purifier has dimensions of:

  • height: 14.6 in
  • width: 9.5 in
  • depth: 9.5 in

This model also has verification by Energy Star and the Association for Home Appliance Manufacturers.

At the time of publishing, the Winix A230 is available to purchase online for around $100.

Levoit Core 300

Levoit claims its Core 300 refreshes the air within 12 minutes, five times an hour, in rooms up to 219 sq. ft. Alternatively, in rooms of 574 sq. ft, it will refresh twice per hour. This model is available in two colors: black and white.

However, it is not compatible with Amazon Alexa and does not have voice control.

Other features of the Levoit Core 300 include the following:

  • a noise level of 24–50 dB
  • Energy Star verified
  • 45W power
  • true HEPA filter
  • automatic fan speed memory

This air purifier has dimensions of:

  • height: 14.2 in
  • width: 8.7 in
  • depth: 8.7 in

At the time of publishing, the Levoit Core 300 is available to purchase online for around $100.

Vornado PC0575DC

The company claims this model is suitable for rooms up to 258 sq. ft. It is only available in white.

Other features of this model include the following:

  • touch controls
  • energy saving motor with quiet operation
  • eight speed settings
  • visual air quality indicator
  • true HEPA filter

This model has dimensions of:

  • height: 24 in
  • width: 15.2 in
  • depth: 11.8 in

At the time of publishing, the Vornado PC0575DC is available to purchase online for around $380.

Coway Airmega 400

This model, available in white or graphite, filters the air in rooms up to 1,560 sq. ft and cleans the air at least twice per hour.

Other features of the Coway Airmega 400 include the following:

  • compatibility with Amazon Alexa
  • three fan speeds
  • a maximum noise level of 43.2 dB
  • energy air certified, consuming 64 W
  • true HEPA filter

This model has dimensions of:

  • height: 22.8 in
  • width: 14.8 in
  • depth: 14.8 in

At the time of publishing, the Coway Airmega 400 is available to purchase online for around $470.

LG PuriCare

LG’s PuriCare covers medium-to-large spaces of up to 310 sq. ft. It has a 360-degree design so that it can reach low-to-ground areas too. This model is only available in white.

Other features include the following:

  • Amazon Alexa and Google Assistant compatibility, alongside touch controls
  • a sound level as low as 25 dB
  • powerful filtration
  • pushes air up to 24 feet
  • true HEPA filter

This air purifier has the following dimensions:

  • height: 23.1 in
  • width: 13.5 in
  • depth: 13.5 in

At the time of publishing, the LG PuriCare is available to purchase online for around $700.

Airthereal Day Dawning ADH50B

This model is suitable for small rooms, as it can purify air in rooms up to 160 sq. ft. It is lightweight and only available in a black and silver design.

Other features of this model include the following:

  • true HEPA filter with three filtration stages
  • rated power of 3.5 W
  • dimensions of 6.3 x 6.3 x 10.2 in
  • noise range of 22–40 dB
  • 100% toxic free

This product has dimensions of:

  • height: 10.2 in
  • width: 6.3 in
  • depth: 6.3 in

At the time of publishing, the Airthereal Day Dawning ADH50B is available to purchase online for around $36.

A few things to consider before purchasing a HEPA air purifier may include:

  • square footage or size of the room
  • noise level
  • cost
  • controls and compatibility
  • dimensions
  • energy consumption

The World Health Organization (WHO) says that household air pollution is the cause of 3.8 million premature deaths every year, mostly attributed to how individuals use solid fuels or kerosene when cooking.

Some conditions with links to household air pollution include:

  • pneumonia
  • stroke
  • ischaemic heart disease
  • chronic obstructive pulmonary disease
  • lung cancer

The Centers for Disease Control and Prevention (CDC) recommend the following measures to improve indoor air quality:

  • keeping windows open
  • regularly clearing dust and pet hair
  • only using bug spray when necessary
  • fixing leaks as soon as possible to prevent mold
  • not smoking indoors

HEPA air purifiers are high quality devices that remove air contaminants indoors. These can also help prevent the buildup of dust and mold.

There are various HEPA air purifiers available to purchase for varying prices and room sizes.