They're driven by wind. Even the slightest breeze will spin 'em. They don't have to be higher than the highest point of the roof, but they'll work better if they are.
You have to allow enough make up air to enter through soffit vents, or they can create negative pressure in a house, drawing air (and smell) back in through plumbing openings. They'll do the same work as a motorized exhaust fan.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
... [Read Article]
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