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In terms of ASHRAE Standard 52.2, G2 is approximately rated to MERV4 whereas G4 corresponds to the MERV7 filtration level. In accordance with EN 779 and ISO 16890, G4 filters can capture 60%-85% of particles that are within 0.3 to 10 microns whereas G2 filters can trap the same size of particles at an efficiency of 30%-50%. On the other hand, our HEPA filters, which are based on EN 1822, can trap at least 85% of most penetrating particle sizes that are below 2.5 microns. * *