S2B&S3B are very simple 1ph industrial vacs, ideal for the metalworking industry where metal chips mixed with oil/coolant have to be removed from machine tools. The version FM is recommended for the collection of fine dust as in the B&C field. In such case a Hepa filter KIT can be added as OPTION S2B is fitted with 2 indipendent`by-pass` motors and available with a 50L bin. Mod. S3B has 3 indipendent `by-pass` motors and is available in 50 L or 100L bin. They are both made of metal plate. The manual filter shaker ensures a good efficiency of the filter and the release container system allows to empty the bin without disassembling the other parts of the vac.