HEPA filter applications
HEPA filter is mainly used to capture particles and various suspended matters above 0.5μm. It usually adopts ultra-fine glass fiber as filter material, offset paper, aluminum film and other materials as dividing plate, and glued with wooden frame aluminum alloy.

It is believed that many filter manufacturers have encountered these problems when selecting air filter testing equipment for their air filter products.First, most of the filter test machine on the market is very expensive, which exceeds the profitability of enterprises. The prices of filter testing

Forklifts need to be used in plant E. At the initial stage, diesel powered forklifts were used because of their high power. But these diesel forklifts also cause problems with the filter. Incomplete combustion of multi carbon oxides is dispersed in the air, enters the air conditioning box through the return air, and condenses on the filter. We observed with a high power microscope and found that the condensate was in a semi flowing state on the primary and medium efficiency filters. Those agglomerates may migrate to the back of the filter material and volatilize due to uneven heating and humidification of the air, enter the HEPA filter downstream, and aggravate the blocking of the HEPA filter. Later, Factory E changed to use electric forklifts, which reduced the chemical pollution in the plant and also alleviated the filter blockage.

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The air conditioning box in the clean workshop of Factory C is manufactured by a new air conditioning factory. It is said that the designer of the air conditioning box is an air conditioning expert from Southeast Asia. The factory began to operate in early autumn. Soon, the weather became cool and t

There is a ring of sealing gasket with good elasticity on the frame of HEPA filter, which closely fits with the high-efficiency air supply outlet. In the process of use, some maintenance and construction personnel will stand on the air outlet. If they are not careful, or the structural strength of t

A clean workshop producing color displays has not been built for long. The air supply volume of the air conditioner has become smaller, and the temperature and humidity are out of control. The temperature is far higher than the set value of 22 ± 1 ℃, reaching 30 ℃, and increases with the increase of

Pre-filters, fine filters and HEPA filters are also filters. What are the differences?

For medical face masks, we often see these characters such as PFE, BFE and VFE. What is the meaning of these indicators? There is a certain correlation between PFE and BFE. For medical face masks, with NaCl aerosol, flow rate 30L/min, when the PFE is higher than 90.0%, the BFE can be higher than 99.0%.
Compared with VFE, PFE, when the PFE reach 91.83%, the VFE can reach more than 98%, even higher than 99%.
Test aerosol of BFE and VFE are bacteria and bacteriophage respectively, and biological experiment is a very troublesome and complicated process. For mask manufacturers, these indicators are too complex as routine tests. Therefore, some indirect experiences are often used in practice.

Particulate matter and gas are two kinds of pollutants in the air. Particulate matter can be filtered out by using separate air filter media, such as melt-blown non-woven fabric, glass fiber, PTFE, etc. However, chemical gases need to be filtered by using substances with strong adsorption capacity. At present, commonly used adsorption materials mainly include activated carbon, activated alumina, zeolite, molecular sieve, ionic resin, etc.

What is MERV？American National Standards Institute (ANSI) and American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) standard 52.2, MERV is minimum efficiency reporting value.It is wrong to say that the higher the MERV, the better the filter. MERV is designed to enable users to select appropriate filters according to the size of particles they want to remove. MERV system is to grade filters, not to comment on which filter is better. Is the protection effect good if the MERV grade of the filter is appropriate？The answer is no. Correct installation is also an important means to ensure the filter efficiency.