From the Manufacturer
The Ventamatic Solar Powered Roof Attic Ventilator with 12.6 watt 18 volt DC Motor has no energy costs. It comes with a steel flange and weathered grey galvanized steel dome. It has a 12.6 watt multi-Crystal panel. It can handle up to 1,000 CFM with additional solar panel. It is designed for attics up to 1,500 square feet. There is no wiring to the AC main power source. Exhaust fans require a minimum of 600 sq-in of net intake airflow [Net Free Area] in order to function safely and correctly. Ventamatic has provided the ventilation industry with an air of excellence for over 60 years. The factory is 100% powered by wind generated power, 95% of all waste products are recycled and the packaging is recycled cardboard.