How many types of HEPA filters are there?

Author:Jason Peng
Cleanroom Engineering Technology Manager of Deiiang Company.

Product R&D Manager of GDC Inc. Cleanroom Equipment Manufacturing Company.

Executive Director of Guangdong Cleanroom Industry Association of China.

Engaged in R&D of related products for 15 years, with rich relevant technical experience
2025-06-30 | Visits:

Understanding the Diversity of hepa Filters: A Comprehensive Guide

High-Efficiency Particulate Air (HEPA) filters are pivotal in maintaining Clean air environments, making them integral to various industries and settings, from healthcare to manufacturing. This guide explores the diverse types of hepa filters by deciphering their functionalities, structural classifications, and filtration efficiencies.

Functionality-based Classification

hepa filters come with functionalities tailored for specific needs, enhancing their versatility:

1. High-temperature Resistant HEPA Filters

High-temperature resistant HEPA filters maintain their integrity and performance in environments with elevated temperatures, such as industrial processes and certain pharmaceutical applications.

2. Activated Carbon HEPA Filters

These filters integrate activated carbon, providing dual functionality by not only trapping particulates but also absorbing odors and volatile organic compounds (VOCs), making them ideal for residential and commercial use.

Structural Classification

The structure of a HEPA filter significantly influences its application and efficiency:

1. Gel Seal (Liquid Groove)

Gel seal HEPA filters ensure airtight sealing through a viscous gel, making them ideal for sensitive environments like clean rooms.

2. With Separators

Filters with separators between the pleats maintain consistent spacing and airflow, enhancing durability and efficiency under fluctuating conditions.

3. Without Separators

These modern designs, improved by innovations, allow for compact construction without sacrificing performance, offering higher airflow capacity in smaller spaces.

Filtration Efficiency Grades

HEPA filters are classified according to their filtration capabilities, adhering to international standards like EN 1822-1:

H13

Captures at least 99.95% of airborne particles, suitable for general air purification.

H14

Offers greater efficiency, retaining 99.995% of particles, commonly used in hospitals.

U15 - U17

Ultra-low penetration air (ULPA) filters capturing up to 99.99999%, essential in Semiconductor manufacturing.

Selecting the Right HEPA Filter

Choosing the appropriate HEPA filter requires an understanding of both the functional requirements and structural designs crucial to achieving desired air quality levels. Advanced technologies tailored for diverse applications underline the commitment to air purity and innovation.

Common Related Questions and Answers

1. What does HEPA stand for?

HEPA stands for High-Efficiency Particulate Air. It refers to a type of filter that can trap a large percentage of very small particles, including dust, pollen, mold spores, and other allergens. HEPA filters are commonly used in air purifiers, vacuum cleaners, and HVAC systems to improve indoor air quality.

2. Are all HEPA filters the same?

No. HEPA filters all meet certain efficiency standards, but they vary in design, size, and performance. While they all provide some degree of filtration, they are usually held to different standards.