SELECT performance FROM table_name_39 WHERE test_standard = "bs en779" AND particulate_size_approaching_100_percentage_retention = ">2µm" AND class = "f6"
Kinerja mana yang memiliki standar uji BS EN779, dan ukuran partikel mendekati retensi 100%> 2μm, dan kelas F6?
CREATE TABLE table_name_39 (performance VARCHAR, class VARCHAR, test_standard VARCHAR, particulate_size_approaching_100_percentage_retention VARCHAR)