Air filter classification​-filter grade and rating introduction

In this article,Clean will bring the newest and most detailed introduction of air filter grades and ratings,US and EU standards,and all things related.

The classification of air filters are different in different countries,due to the different standards.People are always confused by these complex info.There are already many articles about this on the internet,but some are outdate and some are not so exact.We will bring you the newest and the most detailed introduction of the classification of air filter including HEPA.

There are 2 most popular standard for air filter classfication:the Europe Union standard and the United States standard.Although in the year 2016,ISO 16890 was published by Internatinal Standardization Orgnization ,in order to establish a global standard for air filter, it is not mature and rarely used.

The EU standard is more popular,especially when used for HEPA.As for HEPA,cus the US standard is not often used,people in the US also use EU standard to describe HEPA.That’s why Americans serach words like “H13 HEPA”,etc.

The United States standard:MERV,IEST-RP

MERV filter:In United State,air filters whose filtration efficiency lower than HEPA use MERV rating which means Minimum Efficiency Reporting Value,designed by American Society of Heating Refrigerating and Air-Conditioning Engineers(ASHRAE).MERV rating is designed to represent the worst-case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometers. So it is not designed for HEPA.MERV rates from 1 to 16.Some people use MERV 17~20 to refer to HEPA,but this is not quite accurate.

HEPA:HEPA filter is defined by the US Department of Energy (DOE),pointing that filters which can remove 99.97% of contaminant particles 0.3 um in diameter is HEPA.And IEST-RP standard is used to rate a HEPA,from type A to type J.But people rarely use this IEST-RP standard,instead EU standard is prefered.

ULPA:ULPA filter is also using IEST-RP,rating type K.

The Europe Union standard:EN779 and EN1882
In the EU,there are also 2 standards designed for common filters and HEPA.

EN779:This standard is designed for coarse filter,medium filter and fine filter.These filters grades from G1 to F9.

EN1882:designed for EPA,HEPA and ULPA filter.This grade is from H10(older EN1882 version called E10)to U17.Be aware,H10 H11 are not HEPA filter.








How do I know my HEPA Filter is Dirty?

You can tell if your HEPA filter is dirty either by monitoring the general air quality or by examining it directly. If it has a lot of dust, debris, or hair like cloggers, it needs cleaning or replacement.

If HEPA filters get dirty, it cannot perform efficiently and is unable to filter out pollutants. Hence degrading the indoor air quality. Some air filters are washable, while some need to be replaced for proper functioning.

If the HEPA filter does not have any visible debris but is yellowish in color, it is not necessarily dirty. The yellowing of the filter can be caused by oxidation or aging.

mini pleat HEPA filter

Why is it Necessary to Replace or Clean HEPA Filters?

When people rely on air purifiers for maintaining indoor air quality, they should be vigilant about the air filters. It is an established fact that one in nine deaths each year are caused by air pollution. Not changing your HEPA filters in time may worsen the indoor air quality.

The problem is that people are generally unaware of when to change the filters. They only get alarmed when the dust and soot start to flow out through the vent. At this point the filters are quite past their usable date and are barely keeping up.

How do HEPA Filters Work?

HEPA is an acronym derived from High Efficiency Particulate Air. These are the best mechanical filters because these arrest 99.97% of the pollutants. These can capture particles as minute as 0.3 microns.

seperate HEPA filter

The above mentioned design allows HEPA filters to trap almost all the matter particles that enter the inside of the house or a confined space. If the air filter is already congested with dust or debris, it cannot filter the outside air as it is supposed to. In that case, extra pressure will be built on the purifying system. And when the filters give up, these end up circulating impure air throughout the space.

Signs your HEPA filter is dirty:

● A sudden increase in allergies may signify that your air filter has some debris trapped in it. Pet dander is the major pollutant in such cases usually. If you have a pet, its hair can get trapped and circulate in the air throughout your space.

● If the white clothes or sheets near your vents are changing color or getting dirtier than usual, your HEPA filters need an immediate change. It is called a white sheet test. This can be done intentionally as well.

● Hiking electricity bills are also your cue to check if your air filters are doing their job. Because if they do it efficiently, the HVAC system consumes much less energy. So a sudden spike in power fees can be tackled by changing HEPA filters.

● Only dust and debris aren’t the culprit in spoiling an air filter. Sometimes moisture or other physical damage to filters can also reduce the efficiency of air purifiers. To avoid this, regular Eye tests can be done.

Commercially, HEPA filters are found almost in every building. Every centrally air conditioned/heated building regulates the indoor air quality by using HVAC systems and HEPA filters. Such spaces include hospitals, research facilities, offices, etc.

air purifier

Increased awareness about degrading air quality in certain locations around the globe has increased the use of air purifiers and air filters. Household appliances like vacuum cleaners, HVAC systems, and even cars have air filters installed now. So, it shall become a vital habit to keep an eye on your HEPA filters’ cleanliness.








How Often Should HEPA Filter Be Replaced – Is it Worth it?

High-Efficiency Particulate Air (HEPA) filter is commonly used in applications where contamination control is required, such as medical devices, food & beverage, and pharmaceutical products. It is essential equipment to capture bacteria, pollen, dust mites, mold, and other microscopic substances.

However, over time, the HEPA filter and its media elements need to be changed to ensure vacuum functions at a great capacity and trap even the smallest particles effectively. If you want to get rid of allergens, look for a HEPA filter supplier to improve the air quality of your settings and make the right selection.

Read on to learn more about HEPA filters and when to change them for enhanced air quality.

What is a HEPA Filter?

HEPA is a kind of mechanical filter that has the ability to trap up to 99.97% of hazardous airborne particles as small as 0.3 microns. They are mainly used in research, industrial facilities, hospitals, commercial and residential properties due to increased concern for good-quality, fresh air. You can find HEPA filters in various household appliances, such as air purifiers, HVAC systems, and vacuum cleaners.

How does HEPA Filter Work?

It works by driving air into its filtration mechanism, trapping airborne particles like mold, pet dander, pollen, dust mites, virus, and bacteria, and then releasing clean air out. As it has a quite narrow opening, contaminants passing through get stuck on the fiber with methods, including direct impaction, diffusion, sieving, and an interception.

It is equipped with a pre-filter that can help trap large particles like dust and an activated carbon filter that eliminates smoke, odors, and corrosive gases.

When does HEPA Filter need to be Changed?

When used in residential settings:

If you’re using a vacuum with a HEPA filter in a residential area, the filter would last around 2-3 years. However, it depends on how often do you use it, but regular usage based on the average cleaning schedule will keep it running for 24 to 36 months.

When used in commercial settings:

The filter needs to be replaced more often than once every 2-3 years. If you use it in a workspace on a regular basis, make sure to check the filter every 6 months. If it looks dirty and damaged, it should be changed as soon as possible. If not, the HEPA filter needs to be changed once a year when used in the commercial area.

If you notice a musty smell:

If you continue to use a vacuum and witness a musty smell, there is a chance that your HEPA filter will no longer work effectively and needs immediate replacement. The smell may be a sign that replacement is required.

Carbon Pre-Filters:

For an additional layer of filtration, many use carbon pre-filter to remove odors in the air. Similar to HEPA filters, carbon filters need to be changed on an annual basis (commercial settings) and once every 2-3 years (residential settings).

Wrapping Up

You might have understood by now that HEPA filters have a remarkable potential to remove microscopic particles, release fresh, breathable air, and maintain the cleanliness of your home. Keep the above-listed tips in mind to determine when it’s time to change the filter.

Also, you can find high-tech paint shop filters, concertina filters, HVAC filters, activated carbon filters and more at Hubei Clean Environment Protection & Technology Co. Ltd. Feel free to contact us to know more and request a quote.

Why it is Important to Replace Your Air Filters?

Allergens from the air may include dust, pollen, dirt, mold spores, bacteria, and other contaminants that can be hazardous for the environment and public health. It affects indoor and outdoor air quality, which may lead to various reactions from allergic to something life-threatening.

There is only one way to overcome this problem and that is using a high-performing HVAC system. It is advised to change filters after every 90 days to filter dust and dirt more effectively. If your old air filter isn’t working properly, you can look for an air filter wholesale and get it replaced in less than a minute.

Why Changing Your Air Filter Really Matters?

Air filters are vital to capture pollen and dust that would otherwise release in the home and lower the indoor air quality. They also offer great defense against large objects such as loose insulation being pulled into the system or prevent a fire risk. Clogged air filters are not good and could cause an HVAC system failure.

As the filter captures pollutants of your home like dust, fungal spores, fabric fibers, etc., the fine mesh via which air passes becomes dense. Therefore, it is necessary to invest in a reliable pleated filter or panel filter to improve air quality, efficiency, and extend the life span of your system.

Adverse Effects of Dirty Air Filter

  • The blower fan in the HVAC filter needs to work hard to push air

    When the system is working hard, it draws more energy, which means higher bills. It can also wear out from the strain.

  • The difficulty in air movement

    This directly means bad home comfort for you. When the temperature sensors don’t work, the HVAC system might not send the signal regarding the temperature. It also puts strain on the fan motor.

  • The heated or cooled air cannot go out of the furnace

    Even when you’re paying the same amount of energy or using gas or oil, there will be no big difference in indoor temperature.

  • Moisture may gather

    If additional materials are being introduced to pollutants and allergens into the indoor air, it will make a space for more moisture.

When Should You Change Your Air Filter?

It is recommended to change your air filter every month or two, especially when you’ve pets and live in an area prone to pollutants. Replacing your air filter is an easy task. Just get one, slide the old filter out and install a new system. Also, check the unit to identify what size do you require and what Minimum Efficiency Reporting Value (MERV) range the system should fall into.

To know more about how to replace your air filters and what MERV would be suitable for clean indoor air, contact Hubei Clean Environment Protection & Technology Co., Ltd. We’re always here to help fulfill your comfort needs!

Guide to Paint booth Filter: Why it Matters, Key Components and How to Choose

Paint booth filters play a crucial role in keeping the environment free of hazardous fumes and contaminants. It is designed to manage paint booth operations, suitable for automotive, machinery, metal, and wood producing industries. It keeps the air filtration system at maximum capacity, which means it is a great solution to remove toxic fumes and vapors.

Working with an old or dirty filter cannot operate at high efficiency. You shouldn’t take any take to compromise your safety and health. Also, dirty filters can make the ventilation system much harder and this could cause serious problems. That’s why it is vital to invest in a paint stop filter or paint arrestor to create a reliable spraying environment and ensure quality paint functions.

Why Paint Booth Filters Really Matter?

A paint booth filter is important to keep the air filtration system at its best functioning capacity. Your filter plays a significant part in removing toxic fumes and vapors while extracting debris, dust, and other potential contaminants.

Operating with a dirty or obsolete filter can put your safety and overall well-being at stake. It may make your finished product look unpleasant due to contamination and overspray. With this in mind, it is necessary to invest in an advanced paint booth filter to optimize your workspace and streamline your paint booth operations.

Components Included in Paint Booth Filters

Paint booth filters are often used in industrial spray applications. It consists of various components that include but are not limited to:

  • Ceiling filters 

It is placed on the roof of the booth and used to prevent paint from damaging particles from the intake air stream. It is good to invest in ceiling filters made of synthetic fibers to ensure low press drop and high dust holding capacity.

  • Paint-Stop Filter also called paint arrestor

It is ideal for overspray filtration to capture paint overspray in the finishing or coating industry. It is made of non-flammable long glass fiber, which increases the direction of the airflow, and also fiberglass filter ensures an open weave pattern so that paint particles can be absorbed thoroughly.

  • Pre-Filter Bag

It is installed external to the booth, which ensures effective filtration of the incoming air and outgoing air in spray booths. It is made of fine synthetic fibers that ensure low press drop, high dust holding capacity, and effective filtration. It can block overspray that wasn’t retained by exhaust filter media to maintain a clean environment.

  • Pleated Cardboard Filteralso called cardboard concertina filter

A pleated cardboard filter is commonly used for overspray filtration in all types of paint booths. It is suitable for capturing any wet and aerosol particles like gels, adhesives, paints, silicone. It is easy to install, maintain, replace and store, a perfect way to maintain constant airflow.

Choosing Suitable Filter for Paint Spray Booth

Proper intake and exhaust systems are essential for quality finishing results. Not all filters are suitable for your location and industry. The right one is that suits your individual needs and maintains an efficient filtration mechanism in your industry niche.

It is always great to work with professionals who are familiar with spray booth technology. Being a top commercial and industrial air filtration solution provider, we help our customers to understand the principles of the paint booth and supply them with high-performing equipment to enhance their productivity and workplace safety. Feel free to reach out to us for any further queries!

Does hepa filter really help with Covid?

Since the epidemic,we have read too many articles about this question.So do hepa filters really help with Covid?
As an air filter supplier,we can tell you the thuth:Although hepa filter can capture and remove most particles the size of Coivd virus,but the problem is,how you can make the air in your house all pass through it fast?
If you can’t make your house air circulate through your hepa filter such as what used in your air purifier within a short time period,the virus particles will reach to your family before they are captured.Then the hepa filter will have no use.
Most articles ignore this problem when they disscuss how efficient hepa filter works for Covid.CLEAN think it’s not enough only put an air purifier in your room or work office. You must have an efficient enough air circulation system with high power fans in addition.
Some may ask what if put quantities of air purifier at all corners?It’s not a good idea unless you have plenty of time and budget.
The second problem is the replacement of hepa filters.
When the hepa filter is full of virus inside,you can’t touch it without any PPE.This is another overlooked issue.
As for the hospitals and big companies,they can hire proffesionals to install high efficient air loop system with hepa filters,and regular replacement service.So the problems can be solved.CLEAN suggest you do the same thing.Ask proffesional air filter companies to help retrofit your HVAC,rather than simply buy an air purifier.

Purchase of HEPA filters used in sugical masks increased during Covid-2019.

HEPA filters are never mentioned as frequently as this year,due to the increase demand of masks and N95 respirator  during Coronavirus pandemic.

Formerly,HEPA filters are mostly used for industry,and you can find details at the main menu item “industry application for air filter

At the begining of Covid-2019,volunteers sew mask for hospitals.But a cotton mask really do no help for virus.Then people konws about N95 and 3-ply masks has HEPA filters in.See what is HEPA filters at page HEPA filters and high efficency filters

Above is a picture tells the use of HEPA filters for capturing virus.The HEPA filters in masks are usually H13/H14,and the material are Melt blown cloth or PP





Air filters for hospitals and healthcare

Air filtration is very important for hospitals and everything related to medical and healthcare.

Clear air in hospitals and operating theaters is so critical that in fact, bad filtering can have a disaster,  especially during the COVID-19 epidemic period.

We manufacturer air filters for all health applications.



when to use a face mask?

According to the World Health Organization’s information, medial face masks could not protect against the new coronavirus, when you wear them, you must combine with hand hygiene and other preventive measures.WHO only recommends the use of masks in specific cases,
Wear a mask if you are coughing or sneezing.
If you are healthy, you only need to wear a mask if you are taking care of a person with the suspected 2019-nCoV infection.
Masks are effective only when used in combination with frequent hand-cleaning with alcohol-based hand rub or soap and water.
If you wear a medical face mask, then you must know how to use it and dispose of it properly.

When choosing your specific face mask, make sure you choose the appropriate level in which procedures you will be preforming,medical face mask is one kind of our personal protective equipment and it is our goal to manufacture and provide you with the highest quality of face masks.