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Leak test of a high-efficiency filter

Release Date:2020-05-12 08:43

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High-efficiency particulate air (HEPA) filter leak testing generally involves applying challenge particles upstream of the HEPA filter and then using a particle detection instrument to scan the filter surface and frame for leaks. Several different methods of leak testing exist, each suitable for different applications.

Leak detection purpose of high-efficiency filters:
1. Check for damage and leakage in the materials of the high-efficiency filter;
2. Check if the size and material of the outer frame meet the requirements and do not affect installation.

High-efficiency filters are tested by professional testing equipment at the factory and come with a test report and certificate of conformity. Leak detection of high-efficiency filters refers to on-site leak detection after the high-efficiency filter and its system are installed. It mainly checks for small pinholes and other damage in the filter media, such as frame seals, gasket seals, and leaks in the filter frame. The purpose of leak detection is to check the sealing of the high-efficiency filter and its connection with the installation frame, etc., to promptly find defects in the high-efficiency filter itself and during installation, take corresponding remedial measures, and ensure the cleanliness of the area.

Methods for leak detection of high-efficiency filters

High-efficiency air filter leak testing basically involves applying challenge particles upstream of the high-efficiency air filter, and then using a particle detection instrument to search for leaks on the surface and frame of the high-efficiency air filter. There are several different methods for leak testing, applicable to different situations.

Testing methods include:
1. Aerosol photometer test method
2. Particle counter test method
3. Full efficiency test method
4. External air test method

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