turbin ventilator is a type of exhaust fans

Product detail:

TURBINE ventilator
What is it, Turbine Ventilator Auto? Automatic Turbine Ventilator is a type of exhaust fans or roof fans, where the function of the tool is sucking the hot air, dust, and also serves as a means of ventilation / air circulation. Turbine Ventilator Auto does not use electricity, maintenance free, and can work for 24 hours, making it much more efficient than the exhaust fans and roof fans.
How does the Automatic Turbine Ventilator
  Automatic Turbine Ventilator will rotate only with weak winds though, but also able to withstand high winds. Automatic turning Turbine Ventilator also be due to differences in air pressure inside and outside the room, where naturally hot air inside and outside the room will drain and squeeze out through the fin - fin Turbine Ventilator turbine and make the Auto rotate. Thus there is or there is no wind Turbine Ventilator will always revolve suck the hot air in the room
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