The working principle of a, unpowered fan Turbine ventilator is the use of natural wind and heat caused by the temperature difference between indoor and outdoor air convection, turbine rotate so as to make use of centrifugal force and negative pressure effect will indoor fresh hot air out.

Second, the special design of special 1, curved blades of energy efficiency is the best results through scientific calculation, can strictly guarantee absolutely honest let rainwater into working condition. Exhaust efficiency is high, as long as no less than 0.2 meters of the breeze or indoor and outdoor temperature difference of more than 0.5 ℃, lightsome and effective operation. Set up 2, central axis fine steps under high-speed operation of the turbine blades never deformation, thus greatly improves the service life of fan. 3, variable Angle neck design, can make the ventilator under 0-22.5 degrees cant follow one's inclinations of installation, installation is very simple, ordinary people about 30 minutes can be installed.

Three, zero cost of operating expenses, the objective of energy efficiency and economic cost of installation, low maintenance cost.

Four, unpowered fan USES: 1, air convection, row of hot air. 2, reduce air conditioning load, increase indoor fresh air. 3, take out the roof moisture, kegare, steam, stay dry on the roof. 4, instead of heavy electric exhaust fan, reduce support cost save electricity, reduce noise.

Features: no fan only a small amount of wind power can run throughout the year for 365 days. Without the need for electricity. High sensitivity, only the breeze or indoor and outdoor temperature difference can easily drive a turbine blade rotation. Very effective to improve the factory working environment, improve work efficiency. Can bring you fresh air convection, remove heat, gas, or smelly air. Using the whole United States UBC senior Japanese NSK fully sealed bearing, no lubrication, strong and durable. Without motor, no electricity, no noise, small size, light weight, high efficiency, easy installation.