Injectors are HVAC equipment serving to initially speed up and direct the flow of material into transportation lines. These are intermediate equipment placed between a storage tank and a HVAC distribution line. As a rule these are installed after the rotating feeder that provides a volume of material via the injector to the HVAC transportation lines. These are produced in sizes from NW100 to NW600. Connecting flanges are designed base on the type of rotating feeder to which the injector will be attached. Injectors are produced from Class 11 steel or from Hardox. The surface finish is executed as a primer layer of anti-corrosion paint; a specific surface coating or a surface treatment before the final surface finish can be agreed in advance.