Thursday, September 23, 2021

What N95 Respiratory Masks Can Teach Us About Air Filters – Camfil Reports

If you were not familiar with the N95 respiratory mask before the COVID-19 pandemic, you almost certainly are now. The fabrics that make up the N95 mask are easy to breathe through and able to filter out dangerous airborne pathogens too small for our eyes to see. In times like these, N95 masks can be the difference between life and death. While the N95 is widely known, the meaning behind the letter N and the significance of the number 95 may be a mystery. 

Camprotect Pauline Rylander Hagson

What Does N95 Stand For?

N95 masks are highly regulated by NIOSH (The National Institute for Occupational Safety and Health) and should not be confused with FFP masks which are regulated by CEN (European Committee for Standardization). NIOSH classifies the respiratory masks they regulate into one of three categories based upon the intended use. One of the categories is the “N” class which stands for Not-for-Oil. This mask is designed for use in applications where the particles encountered consists of dry, ultra-fine non-oil aerosols such as those generated from grinding, sawing, and thankfully in today’s world, biological particles. The number “95” stands for 95% particle capture efficiency. Higher efficiencies are available, but the N95 mask is the one most commonly used by medical personnel.

Once these masks have been worn, they are not laundered with other hospital fabrics. Despite the high demand for these masks during the COVID-19 pandemic, manufacturers continue to recommend disposing after a single use and not worn day after day. The CDC has issued guidelines when masks may be reused, but the guidelines are limited and recommended to be overseen by professionals. The demand  has driven companies to urgently research effective methods to sanitize and recycle masks. If masks could be easily cleaned and safely reused, demand could be met; however, it’s not a simple task to remove the dirt particles and maintain the 95% particle capture efficiency. 

How the N95 Masks Capture Small Particles 

The fabrics (known as media) used to construct many of these masks are nonwoven, which is to say the fibers are randomly arranged, not woven from yarn in a repeating pattern like the fabric commonly used in clothing. Nonwoven fabrics are not unique; they are used in countless applications we encounter every day. However, the next step in the process is unique and the secret to the mask’s performance. The nonwoven media used in many of these masks is imparted with an electrostatic charge creating an effect, analogous to a magnet, known as an electret. The electrostatic charge greatly enhances the media’s filtration efficiency because the charge attracts  small diameter particles to the relatively large diameter fibers in the media. Without that charge, many of these particles would otherwise easily pass straight through the media.

This media is typically sandwiched between two outer layers of fabric which acts as a prefilter to capture  large particles and to protect the media from being damaged. Safely protected within the mask, the charged fabric makes an ideal filter for a respiratory mask. Unfortunately, an electrostatically charged media may turn out to be a very poor choice for a common HVAC system intake air filter. 

“The most critical performance characteristic of an air filter is particle removal efficiency. The  efficiency of an air filter is based on a test standard known as the MERV (Minimum Efficiency Reporting Value) scale developed by the ASHRAE 52.2 committee. Air filters are tested in a laboratory setting. Basically, an amount of test dirt with known particle sizes is introduced upstream and particles that pass through are counted downstream. The percentage of particles the filter captured is used to compute a MERV value. The MERV value is critical because the individuals responsible for the air quality inside a commercial office building, retail space, manufacturing facility or hospital for example, use the scale to select the MERV value that delivers the air quality needed for the safety of the people, products or equipment within their unique facility” according to Dave Blackwell, Director of Healthcare for Camfil, USA. “An air filter made from a nonwoven media containing a strong electrostatic charge, would seem to be an ideal fabric to use for many products, including air filters” says Blackwell. “However, one of the reasons you can’t  use the same N95 mask day after day is why an everyday intake air filter, made with an electrostatic media, is not a good long-term decision.” 

 

The Effect Accumulating Ultra-fine Dirt Particles Has on Charged Media

It was stated earlier that the “N” in N95 means the mask is intended for non-oil aerosols and the “95” indicates the percentage of ultra-fine particles the mask will capture. The outer layers of the mask act as a prefilter to capture large particles and heavy moisture when the user inhales or exhales. The prefilter ensures the highly-charged media in the center generally only encounters the dry, ultra-fine particles that escape capture in the outer layers. The magnetic-like effect of the charged media attracts these small particles out of the airstream and onto the fibers. 

As ultra-fine particles accumulate on the charged media, an interesting phenomenon occurs that many may recall from a grammar school science class. A magnet will attract a steel coin and if the coin is put on a piece of paper, it can be moved across the paper with a magnet held underneath. Turn the paper sideways and the coin will not fall; appearing to defy gravity. However, add more sheets of paper, repeat the experiment and eventually a point will be reached where the magnet’s influence is unable  to penetrate the paper and the coin falls to the floor.   

An air filter made with highly-charged media will do the same. Much like the magnet and a single piece of paper, the filter may achieve a very high initial particle removal efficiency (MERV) when brand new. When the electret is performing at peak capacity, dirty particles passing by in the airstream are powerfully attracted to the fibers.  However, as particles accumulate on the fibers, they begin to act as an insulator much in the same way adding paper reduced the magnets ability to hold the coin in place. 

As the insulation effect continues, dirty particles begin slipping past in greater numbers. There is an inverse relationship between increasing  insulation and particle capture efficiency.  If it were possible to visibly display the MERV value of an installed filter undergoing this process, the numbers would continuously drop as time passed; 15 to 14 to 13 to 12 for example. Eventually the filter may bottom out three or four levels lower than what its value was when brand new. If a facility manager installed a filter with a high MERV value (i.e. MERV 15) only to discover later it was actually performing at a much lower level (i.e. MERV 12), the consequences could be severe, particularly in these days where there’s a high awareness of airborne viruses.  

An Addition Added to the MERV 52.2 Test Standard to Account for the Phenomenon

Members of ASHRAE’s 52.2 committee were aware of this phenomenon. Appendix J was added to the Standard so consumers would know the actual MERV value of a filter as it is in use, not just when brand new.  The Appendix J conditioning step addresses the electrostatic charge from the media. The result of the second test is listed as a filter’s MERV-A value which is the particle capture efficiency without the benefit of an electret. 

For example, an initial MERV test conducted on a filter  with an electret may result in a published value of MERV 15. However, the same filter tested under the Appendix J procedures may perform as a MERV 12. Putting the two test results together would result in the filter being labeled as a MERV 15 / MERV-A-12A.  This indicates once the electret is no longer effective, the filter performs as if it is a MERV 12. A filter constructed without the value of an electret, could perform as a MERV 15 under the 52.2 standard. The Appendix J procedures are conducted, but since there is no electret to begin with, that filter still performs as a MERV 15. The labeling therefore would show the filter as a MERV 15/ MERV-A-15A indicating the filter performs as a MERV 15 before and after the influence of any electret present has dissipated. A consumer who determined a MERV 15 is required for a particular application would know which filter to select.

Camfil’s Dave Blackwell makes the point. “Charged media is one solution for N95 masks because it delivers a high capture efficiency. The downside is a short service life. Air filters can’t be replaced every day like masks can. What would medical personnel do if they wore the same N95 mask for weeks at a time and somehow the rating on their mask changed as the electrostatic charge became less effective?” questioned Blackwell. “Would medical professionals wear a mask that changed from N95 to N85? N80? N65? I don’t think so. Unfortunately, labels don’t magically change on masks anymore than they do on air filters, but if the labels could change , would a facility manager install a filter with a MERV that changed from MERV 15 to 14 to 13 and then 12? Of course not. That’s why a anyone responsible for the safety of others should select a filter based on its MERV-A value. That number doesn’t change.”

About Camfil Clean Air Solutions 

For more than half a century, Camfil has been helping people breathe cleaner air. As a leading manufacturer of premium clean air solutions, we provide commercial and industrial systems for air filtration and air pollution control that improve worker and equipment productivity, minimize energy use, and benefit human health and the environment.

 

 

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City M Air Purifier Comparison Benefits

Camfil Air Purifier. City M Video Explaining Lifetime Costs of Air Purifiers – Does Your Air Purifier Stack Up?

Camfil USA City M Air Purifier Comparison Benefits

Riverdale, NJ — The market is oversaturated with products labeled as air purifiers claiming to deliver HEPA filtration, for your home, office, or classroom. A search for the term “air purifier” on Amazon yields over a thousand results, with the top suggestions boasting price points as low as $50. 

Air purifiers have become a hot ticket item due to the role of proper air filtration and ventilation in preventing the spread of COVID-19 infections. However, many of the products that have appeared in response to this demand don’t use actual HEPA filters, much less deliver the circulation necessary to protect you from airborne COVID-19 infected particles. 

While  actual HEPA filters should capture 99.995% of particles of  the most penetrating particle size (MPPS) and be individually factory tested and certified, the term HEPA is largely unregulated, leading many manufacturers to falsely claim to use ‘true’ HEPA filters in their air cleaners or air purifiers. 

Furthermore, lower-cost units can turn out to be significantly more expensive in the long run compared to their seemingly pricier counterparts. 

In a new video, Camfil USA explains the factors beyond initial purchase price that should be considered when choosing which air purifier unit to use, such as: 

  • The unit’s operational efficiencies. 
  • The certified particle capture efficiency of the HEPA air filters used in the unit.
  • The filter lifetime and frequency of replacement. 
  • The air changes per hour (ACH) that the unit delivers. 
  • The unit’s energy consumption. 

Watch the full video City M Air Purifier Comparison Benefits for more information on choosing the right air cleaner to protect your lungs and reduce operational costs. 

About Camfil Clean Air Solutions

For more than half a century, Camfil has been helping people breathe cleaner air. As a leading manufacturer of premium clean air solutions, we provide commercial and industrial systems for air filtration and air pollution control that improve worker and equipment productivity, minimize energy use, and benefit human health and the environment. We firmly believe that the best solutions for our customers are the best solutions for our planet, too. That’s why every step of the way – from design to delivery and across the product life cycle – we consider the impact of what we do on people and on the world around us. Through a fresh approach to problem-solving, innovative design, precise process control, and a strong customer focus we aim to conserve more, use less and find better ways – so we can all breathe easier.

 

The Camfil Group is headquartered in Stockholm, Sweden, and has 33​ manufacturing sites, six R&D centers, local sales offices in 30 countries, and about 4,80​0 employees and growing. We proudly serve and support customers in a wide variety of industries and in communities across the world. To discover how Camfil USA can help you to protect people, processes and the environment, visit us at www.camfil.us/ 

 

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Media Contact: 

Lynne Laake 

Camfil USA Air Filters 

T: 888.599.6620 

E: Lynne.Laake@camfil.com

F: Friend  Camfil USA on Facebook

T: Follow Camfil USA on Twitter 

Y: Watch Camfil Videos on YouTube

L: Follow our LinkedIn Page

 

https://www.youtube.com/watch?v=HehqVgATt3o

 

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Wednesday, September 22, 2021

Camfil Air Filter Experts Explain PM 2.5 and New Research from Harvard T.H. Chan School of Public Health Highlights the Importance of Indoor Air Quality and Proper Ventilation.

A new study published on September 9 in the journal Environmental Research Letters has revealed a link between short-term exposure to fine particulate matter and acute decreases in cognitive function. The research was led by the Harvard T.H. Chan School of Public Health. 

The study, which took place over the course of one year, consisted of 300 office employees across six different countries (China, India, Mexico, Thailand, the United Kingdom, and the United States), with participants ranging in age from 18 to 65. The participants in the study worked at least three days per week in the office and were assigned a permanent work station, which was equipped with an environmental sensor to collect real-time measurements of PM2.5 and CO2. Each participant also had an app custom-designed for the study installed on their phone to test cognitive abilities. 

The data collected showed that higher concentrations of PM2.5 and lower ventilation rates correlated with slower response times and reduced accuracy on a series of cognitive tests. Importantly, the research team observed that cognitive function was impaired at concentrations of PM2.5 and COz that are common in indoor environments such as office buildings. 

This study is yet more evidence that indoor air pollution threatens not only the health but the productivity of office employees. 

What is PM2.5? 

Particulate matter, or PM, is defined as any solid or liquid particles that are light enough to remain suspended in the air. Particulate matter is assigned size classifications based on their diameter in microns — PM10, PM2.5, PM1. 

PM2.5, which is sometimes referred to as fine particulate matter, is 2.5 microns in diameter or less and can cause serious long-term health damage when inhaled. Particle pollution can come from a variety of sources, including car exhaust from traffic and wildfire smoke. Additionally, some of the respiratory droplets that are responsible for spreading the COVID-19 virus could be classified as PM2.5. 

In addition to decreased cognitive function, PM2.5 has been linked to increased symptoms of conditions such as seasonal allergies, COPD, and asthma. 

Where Does Indoor Air Pollution Come From? 

Indoor air can be up to 50 times as polluted as outdoor air. In addition to particulate matter, gaseous pollutants can exist at high concentrations indoors. Gaseous pollutants, such as ground-level ozone, are also known to have health effects, including dizziness, nausea, and shortness of breath. 

Indoor air pollution in office buildings comes from multiple sources, which may include: 

  • Outdoor sources. Outdoor sources of air pollution usually enter the building through  HVAC systems with inadequate air filters, doors, windows, and on people’s clothes. In poorly ventilated buildings, this pollution becomes trapped once it has entered, leading to a build-up of high concentrations of pollution indoors over time. Buildings close to high-traffic roads or in dense urban areas are particularly vulnerable to poor indoor air quality as a result of outdoor sources, such as car exhaust fumes.
  • Cleaning chemicals and air fresheners. Cleaning chemicals that are allowed to accumulate in the air due to poor ventilation can be a major contributor to poor indoor air quality. Similarly, air fresheners can linger in the air and worsen indoor air quality. This issue is of particular salience due to the increased frequency and intensity of cleaning and sanitation procedures in offices to combat the spread of COVID-19. 
  • Furniture and furnishings. Cheap, mass-manufactured furniture is a common source of VOC (volatile organic compound) off-gassing. Volatile organic compounds such as formaldehyde can cause adverse health effects. Printers, copier machines, and other office equipment that use large quantities of ink also emit VOCs. 
  • Building inhabitants. Additionally, a commonly overlooked source of indoor air pollution is the building’s inhabitants themselves, who can bring in pollen, pet dander, dust, and other particulate matter on their clothing. Human skin cells are also a large contributor to the buildup of dust, with the average person dropping approximately 40,000 skin cells every single minute. Respiration also adds moisture to the air, and respiratory droplets can carry dangerous pathogens, including the SARS-CoV-2 virus. 

How to Improve Indoor Air Quality for Better Cognitive Function Among Office Employees

The U.S. Environmental Protection Agency (EPA) recommends three steps for commercial facilities managers to improve indoor air quality: identify pollution sources, improve ventilation, and implement air filtration. An air filtration expert can guide you through this process and help find the best combination of solutions to fit your building’s needs and budget. 

What Are recommendations from Camfil’s air quality experts? 

30/30 Dual 9 Panel Air Filter 

Camfil’s 30/30 Dual 9 is specifically engineered to increase particle capture efficiency, lower energy consumption, and last longer than any pleated panel filter before it. As the longest-lasting pleated filter on the market, the Dual 9 is guaranteed to maintain its rated efficiency throughout the filter lifetime of nine to twelve months. 

What is Camfil’s City M Air Purifier? 

The City M air purifier includes both a HEPA filter and an activated carbon filter to remove particulate and gaseous pollutants from the air. The City M air purifier consumes 50% less energy than units of similar size, and operates independently of a building’s HVAC system, making it a good option for any space This in-room air purifier is very quiet, making it ideal for use in offices and other public building spaces. 

Read more about the City M here

What is CamCleaner CC500 Air Purifier?

The CamCleaner CC500 air purifier was originally designed early in the pandemic for hospitals that needed to create negatively pressurized isolation areas. The unit was also engineered to serve as a standalone air purifier for offices, schools, and other public buildings. The CC500’s MERV-9/9A prefilter extends the life of the 99.995% HEPA filter, leading to lower overall running and maintenance costs.

About Camfil Clean Air Solutions

For more than half a century, Camfil has been helping people breathe cleaner air. As a leading manufacturer of premium clean air solutions, we provide commercial and industrial systems for air filtration and air pollution control that improve worker and equipment productivity, minimize energy use, and benefit human health and the environment. We firmly believe that the best solutions for our customers are the best solutions for our planet, too. That’s why every step of the way – from design to delivery and across the product life cycle – we consider the impact of what we do on people and on the world around us. Through a fresh approach to problem-solving, innovative design, precise process control, and a strong customer focus we aim to conserve more, use less and find better ways – so we can all breathe easier.

 

The Camfil Group is headquartered in Stockholm, Sweden, and has 33​ manufacturing sites, six R&D centers, local sales offices in 30 countries, and about 4,80​0 employees and growing. We proudly serve and support customers in a wide variety of industries and in communities across the world. To discover how Camfil Canada can help you to protect people, processes and the environment, visit us at https://www.camfil.com/en-us/ 

 

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Sources: 

https://www.hsph.harvard.edu/news/press-releases/office-air-quality-may-affect-employees-cognition-productivity/

 

The post Camfil Air Filter Experts Explain PM 2.5 and New Research from Harvard T.H. Chan School of Public Health Highlights the Importance of Indoor Air Quality and Proper Ventilation. appeared first on Air Filters for Clean Air.



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Thursday, September 16, 2021

New Video from Camfil Explains MPPS in Air Filtration Technology, with Industry Expert Steve Smith

New Video from Camfil Explains MPPS (Most Penetrating Particle Size) in Air Filtration Technology, with Industry Expert Steve Smith

Expert Steve Smith

Across industries, building managers are turning to HEPA filtration to provide building inhabitants with the highest levels of protection against the spread of COVID-19. There are many factors to consider in making a purchase decision for a HEPA filter or an air purifier that contains a HEPA filter.

Unlike other air filters, which use MERV ratings to indicate particle capture efficiency, HEPA filters are labeled with a number representing the percentage of particles a filter captures.

In a new video, Camfil air filtration expert Steve Smith breaks down the concept of MPPS in simple terms.

“MPPS, in the air filtration world, is the most penetrating particle size, which happens to be 0.1 to 0.3 microns. Smaller and larger particles are actually easier to capture. ”

— Camfil’s CamCleaner Segment Manager, Steve Smith

Watch Camfil’s latest video on MPPS here.

About Camfil Clean Air Solutions

For more than half a century, Camfil has been helping people breathe cleaner air. As a leading manufacturer of premium clean air solutions, we provide commercial and industrial systems for air filtration and air pollution control that improve worker and equipment productivity, minimize energy use, and benefit human health and the environment. We firmly believe that the best solutions for our customers are the best solutions for our planet, too. That’s why every step of the way – from design to delivery and across the product life cycle – we consider the impact of what we do on people and on the world around us. Through a fresh approach to problem-solving, innovative design, precise process control, and a strong customer focus we aim to conserve more, use less and find better ways – so we can all breathe easier.

The Camfil Group is headquartered in Stockholm, Sweden, and has 33​ manufacturing sites, six R&D centers, local sales offices in 30 countries, and about 4,80​0 employees and growing. We proudly serve and support customers in a wide variety of industries and in communities across the world. To discover how Camfil USA can help you to protect people, processes and the environment, visit us at www.camfil.us/

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Media Contact:

Lynne Laake

Camfil USA Air Filters

T: 888.599.6620

E: Lynne.Laake@camfil.com

F: Friend Camfil USA on Facebook

T: Follow Camfil USA on Twitter

Y: Watch Camfil Videos on YouTube

L: Follow our LinkedIn Page

Source: SubmitMyPR
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Sunday, September 12, 2021

Do “DIY Air Purifiers” Work Against COVID-19 in Schools? Not Exactly, According to Air Filtration Experts

Parents and teachers across the country are concerned about COVID-19 in the classroom. Vaccinations for children under twelve are still under trial and are several months away from receiving Emergency Use Approval from the FDA (1). In California, an unvaccinated elementary school teacher made the news by infecting half of their students and a total of 26 people around the school with COVID-19 (2). The presence of new variants makes the already contagion-friendly classroom environment even more likely to spread COVID-19 as well as other illnesses. 

In the wake of the back-to-school season, instructions on how teachers can make their own “air purifiers” for their classrooms are circulating on the internet and highlighted by major media outlets. The design involves a box fan, four low cost MERV-13 filters, and duct tape, all of which can be found at a local home improvement store or big box retailer. Some have claimed the DIY design is as effective as a HEPA equipped air purifier. 

“The single biggest objection I have to that claim,” comments Steve Smith, CamCleaner Segment Manager at Camfil US, “is the MERV 13 pleated filters do not have the particle capture efficiency required to remove a significant amount of potentially virus-laden aerosols from the air stream in a single pass. Expecting this device to be as efficient as a HEPA filter could lead to a false sense of security and actually increase risk.”

How Effective Are DIY Air Purifiers Against COVID-19? 

One claim the proponents of the DIY devices make is that they are as effective as HEPA filter air purifiers because inexpensive box fans move a higher volume of air. However, air circulation (the movement of air in a space) and air filtration (removing contaminants from the air) are two separate functions. High volume air circulation in an unventilated space without adequate filtration will not provide suitable protection against COVID-19.    

“Airflow in the HVAC world is often expressed as CFM, cubic feet per minute” says Smith. “A cubic foot of air is about the size of a standard basketball. If 100 CFM is flowing through an air filter, you can visualize that as 100 ‘basketballs’ flowing through the filter every minute.”

A tested and certified H14 HEPA filter (as found in the Camfil City M) is 99.995% efficient on a single pass. That means the 100 basketballs of air are 99.995% cleared of the size respiratory aerosol particles that could contain the COVID virus. 

The MERV 13 pleated air filters used in the DIY device are far less efficient. In fact, the same 100 basketballs of air would need to recirculate and pass through those MERV 13 filters twelve times in order to equal the cleanliness of air that passes through a HEPA filter only once. 

Making matters even worse, those low priced, two-inch MERV 13 pleated filters used in this device are all made with filter media that achieves the MERV 13 value by relying on a temporary electrostatic charge. 

As the filters load with dirt, the electrostatic charge is no longer capable of maintaining MERV 13 efficiency and the filter often drops to as low as a MERV 8. Without the benefit of the charge, which can happen within weeks of class starting, those 100 basketballs of air would need to pass through the filter almost 75 times to equal a single pass through a HEPA filter. 

(Related article: What N95 Respiratory Masks Can Teach Us About Air Filters.)  

A MERV-8 rated air filter is enough to protect the mechanical parts of your HVAC system from being damaged by large particles of dust and debris, but it doesn’t provide the level of filtration required to capture virus-infected respiratory droplets. Without a HEPA filter that captures 99.995% of these particles in a single pass, a DIY unit like this is essentially just a fan that blows them around the room, but removes very few.

Box fans can, according to the CDC, be used to improve the effectiveness of opening windows as a form of ventilation by pushing the air out (3). 

“If you want to make one of these for your home workshop to control sawdust from power tools, this is a great project to undertake,” advises Smith, “but for serious risk mitigation against COVID in a classroom, a DIY design will not be nearly as effective as a professional air purifier equipped with tested and certified HEPA filters.”

Other Resources

 

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