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No turbines on roof.
The turbines are adjustable so that the spinning part is level even though the roof is slanted.
As the wind moves across your rooftop it turns these turbines and draws air up out of your attic area.
First the rated power of a turbine is a best case scenario.
If you decide to add more turbine vents to your roof be sure to buy ones that are aluminum.
Turbine vents do indeed look like small wind turbines installed on your roof.
These will not rust.
Examine the turbine from the exterior from the roof.
Aluminum no rust.
In addition pay attention to the maximum roof pitch that will work with the turbines.
A turbine may fail to spin if the bearings become rusty or obstructions such as ice leaves or twigs have become wedged into the turbine.
But the fact is neither of those conditions are likely to occur on a rooftop.
It s a measure of how much power the turbine will generate at the highest wind speed that the turbine can tolerate.
No additional source of power is needed and turbines are available in a wide variety of sizes and styles.