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Air filter grades are determined by ISO 16890, which is the current international standard for testing air filters for ventilation systems in the food and beverage industry. It replaced BS EN 779:2012 on 30th June 2018. The test method represents real-life performance much more accurately than previously and the filter classification system (based on particulate matter efficiency or ePM) is much more transparent. Furthermore, for the first time, the same filter classifications are used globally.
The old BS EN 779 air filter grades (G1 to F9) have been replaced with a new filter classification system.
The ISO 16890 classification system reports a simpler percentage efficiency within 1 of 4 particle size ranges:
ePM1 Filter efficiency for particle size range 0.3 - 1 μm
ePM2.5 Filter efficiency for particle size range 0.3 - 2.5 μm
ePM10 Filter efficiency for particle size range 0.3 - 10.0 μm
ISO coarse Gravimetric filter arrestance for filters not able to achieve minimum 50% efficiency at ePM10
The filter efficiency (air filter grade) is reported as a percentage (from 50% - 95% in 5% increments) for each of the ePM ranges above. So, for example, if an air filter is classified as ePM1 = 70%, the filter has been tested and is known to remove 70% of particles in the size range of 0.3 - 1 μm.
With regard to ISO coarse, the percentage gravimetic arrestance is reported in 5% increments (from 5% to 95%).
Section 2 of the BRCGS Food Safety Issue 8 outlines the new international standards (ISO 16890 and EN 16798-3:2017) and explains their relevance to the food and beverage industry.
FOOD INDUSTRY AIR FILTER GRADES
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