Operating Environment 1.Indoor application 2.Environment temperature between -40¡æ and +40¡æ 3. Altitude does not excess 3000m 4. Rlative humidity is not more than 95% (25¡æ) 5.Power grid frequency: 58¡«62Hz(60Hz system)¡¢48¡«52Hz(50Hz system) 6.No corrosive gas or stem and no explosive dust on installation site.