Hartzell's Industrial Exhausters are designed to meet industrial air moving and pneumatic conveying requirements. They are designed for heavy weight service with ruggedness, use, long life, reliability, and performance taken together Available in clockwise and counterclockwise rotations and in standard discharge positions; on Sizes 12" to 29" discharge positions are rotatable; on Sizes 33" to 57" they are fixed position Multiple wheels are available - Type MH (open wheel), TH (open trim wheel), and PW (open paddle wheel) are available in all sizes; Type PR (reinforced paddle wheel) is available in sizes 29" to 57"; and a Type AH (air wheel) is available for high pressure applications. Sizes 12" to 57" wheel diameters in multiple arrangements, Class II, III, or IV CFM in Class II from 250 to 40,500 with SP up to 20", Class III from 1,725 to 45,625 with SP up to 30", and Class IV from 2,400 to 45,625 with SP up to 46"; total efficiencies are 72%.