The solar-powered Solar Star Conversion kit boosts the performance of existing passive attic vents and transforms noisy, powered vents into quiet, efficient units. The Solar Star ventilator uses a 10-watt proprietary photovoltaic solar panel with a brushless motor and five-wing injection-molded fan. The fan works continually to maintain temperature levels and low humidity in the attic. Run by the sun, no electrical hookup is needed; the fan operates at no cost, and savings on heating and cooling bills offer a fast return on investment. 886.765.2882.. www.solatube.com.