CREATE TABLE table_44096 ("Usage" TEXT, "Class" TEXT, "Performance" TEXT, "Performance test" TEXT, "Particulate size approaching 100% retention" TEXT, "Test Standard" TEXT)

Which Class has a Performance test of minimum value, and a Usage of semi hepa, and a Performance of 99.5%?
SELECT "Class" FROM table_44096 WHERE "Performance test" = 'minimum value' AND "Usage" = 'semi hepa' AND "Performance" = '99.5%'
SELECT "Class" FROM "table_44096" WHERE "Performance test" = 'minimum value' AND "Performance" = '99.5%' AND "Usage" = 'semi hepa'