All things being equal wind driven turbine vents also known as a whirlybird roof vent do move more air than flat vents but only when the wind blows.
No turbines on roof.
These will not rust.
It s a measure of how much power the turbine will generate at the highest wind speed that the turbine can tolerate.
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In addition pay attention to the maximum roof pitch that will work with the turbines.
The turbines are adjustable so that the spinning part is level even though the roof is slanted.
Aluminum no rust.
If you decide to add more turbine vents to your roof be sure to buy ones that are aluminum.
Examine the turbine from the exterior from the roof.
No additional source of power is needed and turbines are available in a wide variety of sizes and styles.
Flat roof vents have no moving parts to break or squeak but don t vent as much air as wind driven vents.
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.
Turbine vents do indeed look like small wind turbines installed on your roof.
But the fact is neither of those conditions are likely to occur on a rooftop.