user: Question: Which  Performance has a Test Standard of BS EN779, and a Particulate size approaching 100% retention of >2µm, and a Class of F6?
Columns: ['Usage', 'Class', 'Performance', 'Performance test', 'Particulate size approaching 100% retention', 'Test Standard']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Primary filters', 'G1', '65%', 'Average value', '>5µm', 'BS EN779']
SQL:

assistant: SELECT "Performance" FROM "Table" WHERE "Test Standard" = 'BS EN779' AND "Particulate size approaching 100% retention" = '>2µm' AND "Class" = 'F6';