Kraemer MFG Portable Dust Collectors come in many different filter areas, with 1, 2 or 4 bags, with 6 or 12 top bags and 1 or 2 bottom bags � Filter bags are made from Polyester Beane or Felt. They have 99.97% efficiency and are washable � Dust Collectors are for inside use only � All Portable Collectors come with heavy duty casters, for easy movement � All �S� type Collectors come with dust-tight, magnetic switches in 3 phase electrics � Standard colour is Kraemer sea-foam green, custom colours are available � Sheet metal components are 14 ga, 16 ga, 18 ga and 20 ga CRS � All 3-phase motors are high efficiency, TEFC only