Special performance of unpowered fan
1, arc wind is the best result of scientific calculation, can strictly guarantee the working condition of the wind turbine will not let the rain. The utility model has the advantages of high exhaust efficiency, light and effective operation, as long as the temperature difference of the utility model is not less than 0.2 meters, or the indoor and outdoor temperature difference is more than 0.5 DEG C.
2, the central shaft with a fine step, so that the turbine blades at high speed operation will never be deformed, thereby greatly improving the service life of the fan.
3, variable angle neck tube design, can make the fan in the 0-22.5 degree slope under arbitrary installation, installation is very simple, usually about thirty minutes to complete the installation.