Author: Vanessa 27 Mar. 2025     Category: Understanding Filtration

Ⅰ. Definition and standards of HEPA filter: from military secrets to international specifications

1. Core definition and filtration mechanism

HEPA (High-Efficiency Particulate Air) filter is a high-efficiency filtration device that can intercept ≥99.97% of 0.3μm particles. Its excellent performance comes from the synergy of multiple filtration mechanisms:

Interception effect: When particles move with the airflow, they collide with the fiber due to inertia and are captured. For particles >0.5μm, this effect is dominant.

Diffusion effect: Tiny particles <0.1μm are affected by Brownian motion, with irregular movement trajectories, and are more likely to contact and adsorb with fibers. This effect is particularly significant under low wind speed conditions (<0.05m/s).

Electrostatic effect: Modern HEPA filter materials generally use electret processing technology, which enhances the capture ability of submicron particles through permanent electrostatic charge, and the efficiency can be increased by 30-50%.

2. Comparison of international standard systems

The major HEPA standards in the world have significant differences in test methods and performance requirements:

EN 1822 standard (EU):

  • Using the MPPS (Most Penetrating Particle Size) test method to identify the most penetrating particle size of 0.1-0.25μm
  • H13 level requires MPPS particle interception rate ≥99.95%, pressure drop ≤250Pa
  • Test aerosol is DEHS (dioctyl sebacate) or NaCl

ISO 29463 standard (international):

  • Introducing the 15H-17U grade system, which is similar to EN 1822 but pays more attention to ultra-low leakage rate
  • Requires local leakage ≤0.01% during scanning test

DOE STD-3020 standard (USA):

II. Industrial application scenarios of HEPA: cross-industry clean revolution

1. Common industrial production scenarios

  • Sheet metal workshop: intercept metal dust to protect workers’ lungs; prevent dust accumulation from damaging precision equipment; help companies pass occupational health and safety assessments (OHSAS 18001);
  • Paint spraying room: filter paint mist to avoid pollution discharge, make exhaust gas emissions meet GB 16297-1996 standards, and avoid corporate environmental protection fines;
  • Packaging workshop: block paper dust to ensure product cleanliness, reduce packaging machine failure rate, and maintain packaging machine sensor sensitivity;
  • Food factory: intercept flour, powdered sugar and other food dust; effectively reduce the explosion risk level; improve the pass rate of microbial detection;
  • Help companies pass FSSC 22000 food safety certification.

2. Biomedicine

In cell therapy and vaccine production, HEPA filters are the core equipment for maintaining a sterile environment:

GMP Class A clean room requirements:

  • Continuous monitoring of particles ≥0.5μm, concentration ≤3,520 particles/m³
  • US FDA 21 CFR 210/211 stipulates that H14 (99.995%) filters must be used in key areas

3. Semiconductor manufacturing

Chip production has almost stringent requirements for cleanliness:

Photolithography workshop standards:

III. Practical advantages of Trenntech H13 HEPA

Trenntech H13 HEPA filters’ outstanding performance in the industrial field stems from its professional technical accumulation and rigorous manufacturing process, providing reliable air purification solutions for various industrial environments.

Material Science——Trenntech H13 HEPA uses industry-leading glass fiber filter materials. Through a special gradient density design, the initial pressure difference is controlled at the industry-leading level, and the filtration performance is maintained stable, extending the service life.

Manufacturing process——TrenntechH13 HEPA has introduced a fully automatic folding production line imported from Germany, and cooperates with a strict factory inspection system, including leak detection and wind resistance detection, to ensure the consistency of product performance.

In response to the special needs of different industrial scenarios, Trenntech has developed a series of professional solutions:

  • Explosion-proof H13 HEPA filter, suitable for flammable and explosive environments
  • High temperature resistant series can work continuously at 150℃
  • Anti-corrosion models are specially designed for acid and alkaline gas environments

Trenntech will continue to invest in R&D and innovation, and continuously improve product performance and service systems. Whether it is conventional dust filtration needs or special industrial environment challenges, we will wholeheartedly provide you with the most suitable solutions. For more product details or professional consultation, please feel free to contact our technical team.

Vanessa

My name is Vanessa, and I am a content writer specializing in corporate content creation. With more than 10 years of writing experience, I am committed to providing companies with high-quality, impactful content to help them stand out in a competitive market. My background covers multiple industries, including technology, finance, marketing, etc. In the process, I have accumulated rich knowledge and skills, and can deeply understand the needs of audiences in different fields, so as to create more targeted articles and content. I am good at writing blog posts, white papers, case studies, product descriptions, etc., and I am familiar with SEO optimization strategies to ensure that the content gets good exposure in search engines. At the same time, I also have good project management skills and can complete high-quality works within a tight time frame. I believe that high-quality content can not only convey information, but also build customer trust and brand image.