Broan solar-powered attic ventilators (SPAV) operate without fuel, waste, or pollution. Lower attic temperatures mean less ambient heat makes its way into your home's living space. The SPAV begins operating with the first light of the day, and begins to exchange the air in the attic before the heat of the day. By starting early heat-gain is nearly eliminated. Download this catalog to learn more about the benefits of solar-powered attic ventilation products from Broan.