Concrete Roof Roof Vent Fan 100% Waterproof

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. 

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.

Specifications：

1). No maintenance or operating costs, 

2). Water and dust proof, 

3). Improves air quality, 

4). Improves productivity.