Table:
text: Air filter
Filter classes
Filter classes
Usage_ Class_ Performance Performance_test Particulate_size_approaching_100_retention Test_Standard
Primary filters G1 65% Average value >5µm BS EN779
Primary filters G2 65–80% Average value >5µm BS EN779
Primary filters G3 80–90% Average value >5µm BS EN779
Primary filters G4 90%– Average value >5µm BS EN779
Secondary filters F5 40–60% Average value >5µm BS EN779
Secondary filters F6 60–80% Average value >2µm BS EN779
Secondary filters F7 80–90% Average value >2µm BS EN779
Secondary filters F8 90–95% Average value >1µm BS EN779
Secondary filters F9 95%– Average value >1µm BS EN779
Semi Hepa H10 85% Minimum value >1µm BS EN1822
Semi Hepa H11 95% Minimum value >0.5µm BS EN1822

Question: Which performance has a test standard of bs en779 and a particle size of nearly 100% retention of > 2 µm and a class of f6 among air filters?

Question: Which test standard has a use of secondary filters and a class of f5 question 4 (air filters)?

Question: Which performance has a performance test of average value and a class of f6 under air filter?