Various materials are employed in manufacturing anode bags, each offering different air flow capacities. These include napped poly (both USA manufactured and imported), polypropylene in different weights, Synel, polypropylene and polyester felt with micron options, polypropylene monofilament, nylon monofilament, cotton, cotton duck, canton flannel, and vinyl coated polyester. Air flow capacities range from 4 to 525 cfm, depending on the material and its specific characteristics.