VENTILATOR DOESN’T USE ELECTRICITYGreenRoo, an industrial-duty turbine ventilator, provides an airflow of 5,000 to 10,000 cubic feet (142 to 283 m3) per minute without the use of electricity; the ventilator is powered by wind. It is designed with a Varipitch component to make it compatible with any roof slope. Throat diameter sizes are 12, 24 and 36 inches (305, 610 and 914 mm), and the product weighs less than 70 pounds (32 kg). The ventilator is made from stainless steel for corrosion resistance. (904) 241-9944 / www.thegreenroo.com