Experience Counts Flex-Kone™, Flex-Kleen's series of high efficiency cyclonic dust collectors, have been tested, applied and constantly improved. They incorporate all the experience and know-how developed by Flex-Kleen in 40 years of designing and supplying industrial gas cleaning equipment. For tough gas cleaning problems Flex-Kone™ cyclone dust collectors have been specifically developed for applications requiring high efficiency large diameter collectors where special gas cleaning problems are involved.