<\/p>\n\n\n\n
I. Chinese Standards
Classification System
According to the national standard “High Efficiency Air Filters” GB\/T 13554-2008, it is classified into the following categories:<\/p>\n\n\n\n
High Efficiency Particulate Air (HEPA) Filter: Filtration efficiency \u2265 99.9% (sodium flame method or oil mist method)
Ultra High Efficiency Particulate Air (ULPA) Filter: Filtration efficiency \u2265 99.999% (for particles \u2265 0.1 \u03bcm)
Grade classification: Class A (efficiency \u2265 99.9% at rated air volume), Class B (\u2265 99.99%), Class C (\u2265 99.999%), Class D (\u2265 99.999% and for particles \u2265 0.1 \u03bcm)
Test methods<\/p>\n\n\n\n
The sodium flame method or oil mist method is the basis for efficiency testing, and the test standard refers to GB\/T 6165-2008.
II. European Standards
EN 1822 Standard
It is applicable to sub-efficient to ultra-efficient filters, and the classification is as follows:<\/p>\n\n\n\n
H13: Filtration efficiency \u2265 99.95% (for 0.3 \u03bcm particles)
H14: Filtration efficiency \u2265 99.995% (for \u2265 0.3 \u03bcm particles)
U15 – U17: Ultra-efficient filters, efficiency \u2265 99.9995% and above
EN 779 standard
Applicable to coarse to medium efficiency filters, but for high efficiency and above, refer to EN 1822.<\/p>\n\n\n\n
III. American Standards
ASHRAE 52.2 Standard
Applicable to coarse to sub-efficient filters, classified based on size efficiency:<\/p>\n\n\n\n
High-efficiency filters: Corresponding to H13 to H14 grades, with efficiency \u2265 99.95% to 99.995%
IEST-RP-CC001 standard
Specifically designed for high-efficiency and ultra-high-efficiency filters, with performance requirements similar to EN 1822.<\/p>\n\n\n\n
IV. Key Performance Parameters
Material Requirements<\/p>\n\n\n\n
Tensile strength of filter paper: longitudinal \u2265 0.7 kN\/m, transverse \u2265 0.5 kN\/m
Frame material: cold-rolled steel plate (1.0 – 2.0 mm), aluminum alloy (1.5 – 2.0 mm), stainless steel (1.0 – 2.0 mm)
Production environment<\/p>\n\n\n\n
The assembly workshop for high-efficiency filters needs to meet the air cleanliness level of 8.<\/p>\n\n\n\n
V. Application Scenarios
H13\/H14: Biological laboratories, hospital clean rooms, semiconductor factories
U15-U17: Advanced electronic manufacturing, nuclear industry, and other high-precision environments
The above standards and grade classifications reflect the quantitative requirements for air filtration performance in different regions. In actual selection, a comprehensive assessment should be made based on specific application scenarios and testing standards.<\/p>\n\n\n\n
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