Severe Duty Motors are totally enclosed fan cooled (TEFC) motors built for dirty, wet and corrosive environments that wear out standard motors quickly. Cast iron frames and end brackets, shaft seals, corrosion-resistant paint and Class F insulation extend service life, and many are inverter duty rated per NEMA MG 1 Part 31, with IEEE 841 models for petroleum and chemical service. They drive pumps, fans, compressors and conveyors in chemical plants, pulp and paper mills, mining and wastewater treatment.