Advantage：
1). No maintenance or operating costs,
2). Water and dust proof,
3). Improves air quality,
4). Improves productivity.
5). The structure of the high quality,
6). The precision of the running device,
7). Green environmental protection ventilation equipment.
Product Description：
No power ventilation fan is use the natural wind speed to promote the fan turbine rotation,and use the indoor and outdoor air convection principle,any parallel direction of air, accelerated flow and transformed into the vertical air,improve the indoor ventilation effect.
Usage:
1,It can absorb the hot air, moisture, dust, foul smell, smoke from residence and from kitchen chimneys of workshops automatically, also it can decrease indoor noise, increase light.
2,It runs automatically all the time and no stop according to natural weather; It doesn't need any power, saving energy and cost.
3, It is installed on the top of buildings or on the wall with good appearance.
4, Simple and convenient installation, No Operational and Maintenance Costs.
5, No roof leaking, 100% waterproof result with raining or snowing weather.
Specifications：
1). No maintenance or operating costs,
2). Water and dust proof,
3). Improves air quality,
4). Improves productivity.