ISO 29463 originates from EN1822, which defines EPA, HEPA and ULPA filters commonly used in industry. While ISO 29463 maintains the classification of EPA, HEPA and ULPA.But replace E10-E12, H13-H14 and U15-U17 with the following 13 filter levels. The ISO 29463 can't replace EN 1822, EN 1822 will continue to be valid.

In modern air filtration applications, users are increasingly concerned with how well filters remove particles in the PM2.5 and PM10 size ranges. ISO 16890 is now the leading international standard for evaluating air filter performance for general ventilation.
This article provides a clear explanation of how ISO 16890 defines and measures ePM1, ePM2.5, ePM10, and Coarse filtration efficiencies, as well as key topics such as aerosol types, particle size classification, data processing, and equipment design requirements.

It is generally believed that as airflow increases, face velocity increases, and filtration efficiency decreases. In other words, lower airflow (lower velocity) should lead to higher filtration efficiency.
However, in actual testing—such as at 500 m³/h—the opposite is sometimes observed: efficiency decreases when airflow is reduced. This article aims to analyze the underlying reasons. Notably, this phenomenon has also been observed by experienced professionals in the filtration industry, and we share our findings and discussion here.

EN 1822, ISO 29463, and IEST-RP-CC003.4 are three key standards for classifying and testing HEPA (High-Efficiency Particulate Air) and ULPA (Ultra-Low Penetration Air) filters. While they share similarities, they differ significantly in testing methods, particle size considerations, classification, and application scope. Below is a comprehensive comparison.

EN 14683 applies to medical face masks, focusing on bacterial filtration and splash resistance.
N95 respirators follow NIOSH standards, focusing on particle filtration and facial fit.

ULPA filters, such as U15, U16, and U17, demand incredibly high efficiency, capturing particles as small as 0.1μm with up to 99.999999% efficiency. For filter material manufacturers, achieving and verifying this level of performance poses significant challenges.

In light of these considerations, a 0.1 μm particle counter is generally sufficient for most industrial applications. While it may not detect the smallest particles required for precise MPPS measurement in membrane filters, the alternative procedure outlined in ISO 29463 ensures that accurate and reliable filtration efficiency can still be determined. The SC-FT-1406DU, with its high efficiency range, further supports these testing needs, balancing the need for practical solutions with the technical limitations of available particle detection technology.

In the realm of air filtration, the efficiency and longevity of filters are paramount. One innovative method to enhance these aspects is ultrasonic aerosol agglomeration. This technique leverages high-frequency sound waves to manipulate particle deposition, subsequently affecting the pressure drop across air filters. This article delves into the mechanics of ultrasonic aerosol agglomeration, its benefits, and its implications for air filter performance.

HVAC (Heating, Ventilation, and Air Conditioning) air filters play a critical role in modern buildings, ensuring indoor air quality and protecting the efficient operation of HVAC systems. This article examines the key test parameters for HVAC air filters, the relevant international standards, and detailed test methods to help industry professionals and technicians better understand and select the appropriate filters.

In today's world, with increasing concerns about air quality and its impact on health, the need for effective air filtration systems has become paramount. ISO 16890 stands out as a crucial standard in this regard, providing a framework for evaluating the performance of air filters. Let's delve into