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The Hurricaneâ„¢ Wind-Driven Turbine Gravity Ventilator allows users to ventilate their commercial or industrial building without the need for a powered roof exhaust fan, the company says. The unit requires no electrical or maintenance costs to operate, providing a 2-3 year payback on investment, says the company. It also offers a lower first cost because wiring, starter, and associated electrical costs are eliminated. With its lightweight aluminum design, no framing is required, the manufacturer says.