FEATURES: • Inverter Grade® Insulation System (Meets NEMA®† MG-1 Part 31) • Class F Thermostats (One Per Phase) • Shaft Grounding Ring • Corrosion Resistant Mill & Chemical Duty Paint • Cast Iron Frame, Cast Iron End Brackets • Stainless Steel Nameplate & Zinc Plated Hardware • Shaft Slinger On Pulley End For IP54 Protection • Dual Voltage 230/460 Volts (1-100 HP) • 40°C Ambient, NEMA®† Design B Performance On 60 Hz Sine Wave Power • Regreasable Ball Bearings 250 Frame & Up, Lifting Provisions • Double Shielded Bearings 140-360, Open On 400-440 • Double Dip & Bake With Extra Bracing • Class F Insulation, 1.15 S.F. On Sine Wave / 1.0 S.F. On PWM • Constant Horsepower To 90 Hz • Steel Fan Cover & Conduit Box • Field Convertible To F2 Mounting • Condensation Drains With Plastic Plugs • Conversion Kits: All Cast Iron Upgrade, C&D Flanges, Canopy Kits • C-Face Footed 1-5 HP • Bearing Caps On 400-440 • Non-Drive End Insulated Bearing On 400-440