As having sold a brand with a 25 year warranty, you’re misinformed. Principles of attic ventilation is to displace the hot attic air with the cooler air from the eave vents. Attic fans do this in spite of what some say without having accessed diagnostic studies done by reputable agencies. Temperature reduction is generally no less than 20 degrees. Go to Airvent.com for a bit of info why certain roof vents are ineffective and why fans do provide heat reduction.
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