Question: Which  Performance has a Test Standard of BS EN779, and a Particulate size approaching 100% retention of >2µm, and a Class of F6?
SQL: SELECT "Performance" FROM "2-1680877-1" WHERE "Test Standard" = 'BS EN779' AND "Particulate size approaching 100% retention" = '>2µm' AND "Class" = 'F6';

Question: Which Performance has a Usage of Hepa and a Class of H14?
SQL: SELECT "Performance" FROM "2-1680877-1" WHERE "Usage" = 'Hepa' AND "Class" = 'H14';

Question: Which Particulate size approaching 100% retention has a Usage of Semi Hepa and a Class of H12?
SQL: SELECT "Particulate size approaching 100% retention" FROM "2-1680877-1" WHERE "Usage" = 'Semi Hepa' AND "Class" = 'H12';

Question: Which Test Standard has a Usage of Secondary filters, and a Class of F5? Question 4
SQL: SELECT "Test Standard" FROM "2-1680877-1" WHERE "Usage" = 'Secondary filters' AND "Class" = 'F5';

Question: Which Performance has a Performance test of Average value, and a Class of F6?
SQL: SELECT "Performance" FROM "2-1680877-1" WHERE "Performance test" = 'Average value' AND "Class" = 'F6';

Question: Which Class has a Performance test of Minimum value, and a Usage of Semi Hepa, and a Performance of 99.5%?
SQL: SELECT "Class" FROM "2-1680877-1" WHERE "Performance test" = 'Minimum value' AND "Usage" = 'Semi Hepa' AND "Performance" = '99.5%';