Ridge Vent Vs Turbine. On 1400 sqft of attic space). Turbine vent, remember that ridge vents also need accurate, skilled installation to work properly. A ridge vent runs across the top of the roof's peak.
Read about roof vents, and why fan or turbine vents are not as efficient as ridge vents.
The slightest wind turns the vent, which in turn draws air from the attic. Turbine vents, like the solar vents i discussed with philip, will increase exit venting from the area of a roof around where the vent is located. All aura gravity ventilators are made of rust free aluminum. As soon as it starts to spin, it vacuums air out of your attic. I have done a few experiments checking attic temp. A turbine works better than the ridge vent during the winter to help prevent ice dams when deep snow can block ridge vents. More air is allowed to flow and vent the hottest portion of the roof 'the ridge'. The differences between roof vent and ridge vent is listed here.
