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History of HEPA filter development

Час: 2022-12-02

Forty years ago, the domestic HEPA filter appeared in China, its appearance size is 484mm×484mm×220mm.

At that time, the installation module designed by the researcher was 500mm×500mm, and the section size of the filter was determined to be 484mm×484mm in consideration of the need to reserve the position of the suspender.

Another theory is that a British filter was surveyed at that time and its size was 484mm by 484mm.

Early trade codes for the 484mm filter were GS-01 and GB-01. Where, S stands for asbestos fiber, B for glass fiber, G for filter, 01 for frame length 484mm. The GB here has nothing to do with today's national standard.

China 630 Series

Another popular size for HEPA filters in China is 630mm×630mm×220mm. Similar to the background of the 484mm production, the researchers determined that the installation module was 650mm, which, minus the installation clearance, became 630mm. The 630mm is derived in 315mm, 945mm and 1260mm.

Early trade codes for the 630mm filter were GS-03 and GB-03, where 03 stands for 630mm frame length.

320mm unique to China

The early trade code of 320mm×320mm×260mm filter is GS-02 and GB-02. This specification used to coexist with 484mm and 630mm, but now it is very rare. Occasionally, the thickness of the filter is 220mm instead of 260mm.


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