Flex ducts are regularly used to transfer light dust particulate away from a specific area. This is often done for safety reasons in many occupational fields because dust can be harmful to health. The type of dust involved in these applications can vary from very fine wood dust to fertilizer particulate. You want a hose with a firm but flexible body. The right mix of durability and flexibility makes PVC great materials for a flexible duct. For the more heavy duty dust applications, such as in debris-related dust collection, flex ducts made of neoprene coated fabrics, thermoplastics, and urethane in that order come highly recommend in the industry