FRENIC-eFIT series does not need an electric board dedicated to operation even under bad environment including production line under the environment filled with corrosive gas, outdoor facility exposed to the direct sunlight or the factory in the coastal area concerned about salt damage. In addition, achievement of the cooling fan-less for all of the products of this series enable maintenance-free and long service life under the bad environment. FRENIC-eFIT is the environmental resistance inverter using the in-house developed semiconductor.