25REZGB, 60 Hz, Propane Industrial Gaseous GeneratorsStandard Features KOHLER Co. provides one-source responsibility for the generating systems and accessories The generator set and its components are prototype-tested, factory-built, and production-tested The 60 Hz generator set offers a UL 2200 listing. The generator set accepts rated load in one step The 60 Hz generator set meets NFPA 110, Level 1, when equipped with the necessary accessories and installed per NFPA standards A one-year limited warranty covers all generator set systems and components. Two- and five-year extended limited warranties are also available.