THE HAZEMAG SECONDARY (TERTIARY) B-TYPE DRUM ROTOR - The B-type rotor (2 or 4 row design) is normally utilized for the reduction of lower abrasive limestone and for the processing of glass. As a result of its heavy duty design, this rotor is capable of reducing material up to minus 4”. The blowbars are secured to the rotor body by a bolt/nut assembly. They are reversible (1 time) for optimum wear life. This rotor design is normally utilized on the secondary/tertiary impactor models: APS and APSFM/6 row design.