Filter and Protect offers Ring Type Air Solid Separation Filter Bag. Filter and Protect offers a wide range of dust collector bags, filter bags and air filters. The Ring Type Air Solid Separation Filter Bag is circumferentially reinforced low temperature bag used in various applications like air-solid separation in cement, steel, aluminum smelter, flour, mining, arc furnaces, asbestos, ceramics, grains, lead, milk powder and plaster.