<|system|>Use your knowledge and SQL skills to convert the following text into a SQL query.
Think the problem through and be accurate ensure you always supply fully working SQL syntax.

SQL Statments should be wrapped in <codestart type="sql"> and </codeend> tags.

Example output:
<codestart type="sql">SELECT * FROM table_name;</codeend>
<codestart type="sql">SELECT column_name FROM table_name WHERE column_name = 'value';</codeend><|end|><|user|>Which  Performance has a Test Standard of bs en779, and a Particulate size approaching 100% retention of >2µm, and a Class of f6?

SQL Table Create Statement:
CREATE TABLE table_name_39 (performance VARCHAR, class VARCHAR, test_standard VARCHAR, particulate_size_approaching_100_percentage_retention VARCHAR)<|end|><|assistant|><codestart type="sql">SELECT performance FROM table_name_39 WHERE test_standard = "bs en779" AND particulate_size_approaching_100_percentage_retention = ">2µm" AND class = "f6"</codeend><|end|>