True HEPA Filter vs HEPA Filter: Choosing the Right One

If you're in the market for a new air purifier, you've probably come across the terms "True HEPA Filter" and "HEPA Filter". While they may seem interchangeable, there are key differences between the two.

A HEPA Filter, or High Efficiency Particulate Air Filter, is a type of air filter that captures 99.97% of particles as small as 0.3 microns. However, not all HEPA Filters are created equal.

True HEPA Filters, on the other hand, are designed to capture even smaller particles, including those as small as 0.1 microns, making them a better choice for people with severe allergies or respiratory issues.

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A HEPA filter is a type of pleated mechanical air filter that is highly regulated and rigorously certified.

They are made of materials like tightly interwoven glass and synthetic fibers that allow only the tiniest particles to pass through.

A true HEPA filter is required to meet strict standards set by the United States Department of Energy and can trap 99.97% of particles that are 0.3 micrometers in diameter.

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These filters are particularly effective in the medical setting where they help prevent the spread of germs to staff and vulnerable patients.

The capture ability of HEPA filters for particles between 0.3 and 10 microns is reported by Minimum Efficiency Reporting Values, or MERVs, which can range from 2 to 20.

A HEPA filter is made of tightly interwoven glass and synthetic fibers that allow only the tiniest particles to pass through.

These filters are designed to remove a minimum of 99.97% of dust, pollen, mold, bacteria, and any particles in the air with a diameter specification of 0.3 microns (µm).

Particles that are larger or smaller than 0.3 microns are trapped with even greater efficiency by HEPA filters.

A "true" HEPA filter conforms 100% to the DOE filtration standards and allows for the highest indoor air quality levels.

HEPA filters' capture ability for particles between 0.3 and 10 microns is reported by Minimum Efficiency Reporting Values, or MERVs – a rating that comes from a test method developed by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE).

The filter's rating can range anywhere from 2 to 20, with higher ratings indicating better-capturing power.

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True HEPA filters are not necessarily certified by the Department of Energy (DOE), but rather conform to the DOE standard.

Manufacturers may use the term true HEPA to indicate that their filters meet the DOE standard, even though they can't obtain DOE-level certification.

True HEPA filters are actually the same as HEPA filters in terms of their 99.97% efficiency in removing particles 0.3 microns in size.

The term true HEPA is often used as a marketing ploy by manufacturers, but it can also be a genuine attempt to convey that their filters meet the DOE standard.

In reality, the only difference between HEPA and true HEPA is the level of certification, not the actual performance of the filter.

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There are three main categories of HEPA-certified filters. These categories are the primary focus of the air filtration community.

True HEPA filters are the only ones that provide the level of filtration required to capture 99.97% of particles down to 0.3 microns.

Filters claiming to be "HEPA-like" or "HEPA-type" may offer some filtration but fall short of the rigorous standards set by the DOE.

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HEPA filters use a highly efficient mechanism called mechanical filtration to capture airborne particles. This mechanism is what sets HEPA filters apart from other types of filters.

The filters consist of a dense matrix of randomly arranged fibers that create a tortuous pathway for the air to pass through. As air flows through the filter, it encounters a series of obstacles that slow it down and allow the fibers to trap particles.

Three main mechanisms come into play as air flows through the filter: impaction, diffusion, and interception. Impaction occurs when larger particles collide with the fibers and become trapped, while smaller particles experience diffusion, a process where they change direction and adhere to the fibers.

Particles that follow the airstream closely are trapped through interception, as they get caught by the fibers as the air flows through the filter. This combined process ensures that particles as small as 0.3 microns have an extremely high probability of being captured.

The efficiency of these filters is particularly crucial for individuals with allergies or respiratory conditions, as they can provide relief from allergy symptoms and create a more comfortable living environment.

There are three main categories of HEPA-certified filters.

HEPA filters are categorized based on their ability to capture particles of different sizes. True HEPA filters, for example, can capture 99.97% of particles down to 0.3 microns in size.

Only true HEPA filters provide the level of filtration required to capture particles of this size, offering superior protection and ensuring that your facility meets air quality standards.

A true HEPA filter can capture 99.97% of particles down to 0.3 microns, which is crucial for maintaining clean and safe indoor air quality.

HEPA filters can remove a wide array of airborne particles, including dust, pollen, pet dander, mold spores, and some bacteria and viruses.

The efficiency of HEPA filters is particularly important for individuals with allergies or respiratory conditions, as they can provide relief from allergy symptoms and create a more comfortable living environment.

True HEPA filters can capture particles as small as 0.3 microns with a minimum efficiency of 99.97%, making them highly effective in improving indoor air quality.

However, HEPA filters may not capture 100% of viruses and bacteria directly, as most are smaller than 0.3 microns, but they can still play a role in reducing their presence in the air by removing the larger particles that carry them.

Ultrafine particles, which are particles smaller than 0.1 microns, may not be captured as efficiently by HEPA filters, and HEPA filters are also ineffective against gases and odors due to their mechanical filtration mechanism.

Real HEPA filters conform to the 99.97% standard, regardless of particle or contaminant, and can capture and remove particles, including virus aerosols and particulate matter.

True HEPA filters are certified to capture at least 99.97% of particles as small as 0.3 microns, meeting or exceeding DOE standards.

The Department of Energy (DOE) verifies HEPA air filters for government and military use, but not for consumer products. This gap in official certification leads to the emergence of terms like "true HEPA."

Several certification standards can help consumers gauge the performance and credibility of HEPA filters, including AHAM and CADR.

AHAM's verification involves rigorous testing and independent evaluation to ensure that the filter's claims match its actual performance. The CADR rating indicates the air purifier's effectiveness in removing specific airborne pollutants.

True HEPA filters have undergone independent testing and certification to meet or exceed DOE standards, unlike "HEPA-like" or "HEPA-type" filters that may not provide the same level of air purification.

Approved HEPA filters designed for your equipment ensure optimal performance and protect your investment by guaranteeing proper fit and function, safeguarding your equipment's warranty and preventing potential damage.

HEPA filters can play a huge role in reducing the spread of airborne pathogens and reducing the transmission of airborne viruses, including influenza and the common cold.

Choosing the Right HEPA Filter is crucial to ensure you're getting the best air purification for your facility.

The best choice of HEPA filter will vary depending on the type of pollutants you're dealing with and the sensitivity of your facility populations.

Don't be misled by filters claiming to be "HEPA-like" or "HEPA-type" - these may offer some filtration but fall short of the rigorous standards set by the DOE.

To avoid falling victim to subpar products, consumers should be vigilant and learn to recognize genuine HEPA filters from dubious ones.

Purchasing from reputable and well-established brands or authorized dealers significantly reduces the risk of purchasing counterfeit or low-quality filters.

The main types of HEPA filters to look at are H13 and H14, with H13 Medical-Grade HEPA filters being the best option for highly vulnerable patient populations or hazardous pollutants.

For most residential and average office settings, true HEPA filters with efficiency levels around 99.97% provide adequate air purification without overspending on higher classes of filters.

Identifying the appropriate level of efficiency that suits the specific needs of the indoor environment is crucial, and true HEPA filters with efficiency levels around 99.97% are more than sufficient to provide excellent air purification for most settings.

Maintaining your HEPA filter is crucial for optimal performance.

Replacing the filter at the appropriate intervals is the most reliable option to ensure the best air purification results.

Not all HEPA filters are designed to be washed, and improper cleaning can damage the filter, reducing its effectiveness.

Proper cleaning procedures should be followed according to the manufacturer's guidelines, but even with proper cleaning, true HEPA filters may not regain their original performance.

Regular filter replacement will ensure that HEPA filters continue to deliver effective air purification while promoting a healthy indoor environment.

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HEPA filters can capture COVID-19 particles, thanks to their ability to trap particles that contain coronaviruses.

Real HEPA filters conform to the 99.97% standard, regardless of particle or contaminant. This means they're highly effective in reducing allergens present in indoor environments.

HEPA filters are particularly valuable for individuals with allergies or asthma, as they efficiently trap common allergens like pollen, dust mites, pet dander, and mold spores.

Using HEPA air purifiers in bedrooms and living spaces can make a noticeable difference in overall well-being, especially for those prone to sneezing, coughing, itchy eyes, and respiratory distress due to allergies.

With HEPA filters, occupants can breathe easier and enjoy their living spaces without constant allergic reactions.

True HEPA filters excel at capturing particles as small as 0.3 microns with a minimum efficiency of 99.97%. However, they may not be as effective in eliminating volatile organic compounds (VOCs) or other chemicals from the air.

They're highly effective in capturing particles down to 0.3 microns, but may not be as effective against gases and odors due to their mechanical filtration mechanism.

Ultrafine particles, which are particles smaller than 0.1 microns, may not be captured as efficiently by HEPA filters. This means that certain allergens, bacteria, and viruses can also be smaller than 0.3 microns and may not be completely protected against.

Being misled by non-certified filters can lead to inadequate air purification, potentially putting people at risk of exposure to harmful airborne particles. Choose certified HEPA filters that fit your facility's specific needs.

The best HEPA filter for your facility depends on the type of pollutants you're dealing with and the sensitivity of your facility populations.

You'll want to consider certified HEPA filters that fit your facility's specific needs, as non-certified filters can lead to inadequate air purification and put occupants at risk of exposure to airborne particles.

Choose true HEPA filters that capture 99.97% of particles down to 0.3 microns, offering superior protection and ensuring your facility meets air quality standards.

Don't be misled by filters claiming to be "HEPA-like" or "HEPA-type", as they fall short of the rigorous standards set by the DOE.

True HEPA filters are the most reliable choice for maintaining clean, safe indoor air quality in facilities like medical centers or other sensitive environments.

Download our HEPA vs. ULPA Guide to learn more about the differences between filter types and determine which is right for your facility.