Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which  Performance has a Test Standard of bs en779, and a Particulate size approaching 100% retention of >2µm, and a Class of f6?

### Inputs:
table_name: table, columns: ['Usage', 'Class', 'Performance', 'Performance test', 'Particulate size approaching 100% retention', 'Test Standard']

### Response:
SELECT Performance FROM table WHERE Test Standard = bs en779 AND Particulate size approaching 100% retention = >2µm AND Class = f6