.The installation altitude is not more than 2000m;
.The ambient air temperature is not higher than +40 and not lower than -5, the average temeperature of 24 hours is not more than +35 (except for special order);
.Atmospheric relative humidity no more than 50% when the highest temperature is 40 ℃when there is a lower temperature,it can be allowed to have a higher relative humidity, such as 2O℃ 90[%],and considering the condensation on the surface of the product caused by temperature changing;
.No rain and snow;
.Pollution level is 3.