NAE F56C1/3M4A General Purpose Rolled Steel Electric Motor used for Pumps; Fans; Blowers; Compressors; Conveyors; Material handling equipment; Other industrial and commercial machinery; Damp, dusty or dirty environments; Suitable for use with variable frequency drives> Service factor: 1.15 @ 60 Hz; NEMA Design B Performance/ High starting torque; Removable feet; 56CH frames: Feet are dual-drilled for 56C and 143/ 5T mounting flexibility. Class F insulation system; Class B rise at full load; Class H vacuum pressure impregnation (VPI) resin for all windings; Corrosion-resistant epoxy paint, stainless steel nameplate and zinc plated hardware and aluminum endbells; IP55 protection; Condensation drain with plugs. Sealed bearings; 3-year warranty (extended warranty available)