CREATE TABLE table_44095 ("Usage" TEXT, "Class" TEXT, "Performance" TEXT, "Performance test" TEXT, "Particulate size approaching 100% retention" TEXT, "Test Standard" TEXT)

Which Performance has a Performance test of average value, and a Class of f6?
SELECT "Performance" FROM table_44095 WHERE "Performance test" = 'average value' AND "Class" = 'f6'
SELECT "Performance" FROM "table_44095" WHERE "Class" = 'f6' AND "Performance test" = 'average value'