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People use power vents also but you have to have power or install solar powered vents. They all move air well. I like the whirlybirds(old roofer talk) no power and they self sustainable last a long time.

I've installed them on commercial roofs and haven't had one leak idk it how they are designed. I'm pretty sure the Google can give a better answer of a better answer but they work great. Installed a bigger style that one on a bakery which attic was got moldy bad. It dried it all about in about a...

It's not a complete waste of money if the winters are very cold and the summers are hot. It's up to them at the end of the day.

https://www.homedepot.com/p/Turbine-Boss-Automatic-Damper-for-Turbine-Ventilator-100-A/100661459

They also sell damper kits that are automatic open when it's hot and close when it's cold.

Install a whirly bird or static vents on the roof. https://www.lowes.com/pd/Air-Vent-12-in-Aluminum-Internally-Braced-Roof-Turbine-Vent/1000405105