The VB Series is our line of continuous-duty, Vertical Vibrators with top and bottom concentric flanges. These Vibrators are typically used in circular screens and are not supplied with eccentric weights. This Series complies with IEC and EN Zone 21 and 22 standards for use in potentially explosive atmospheres due to the presence of powders. CSA approved Class 1, Div 2 Groups A, B, C and D upon request. These Vibrators are available: 3Ph Power; in 1800-RPM or 1200-RPM @ 60-Hz / 1500-RPM or 1000-RPM @ 50-Hz; Centrifugal Force Range: 5,500 to 11,000 lbf.