Solar Powered Day & Night Ventilator, the Sunsei Solar Vent provides silent and reliable ventilation. Keeps areas comfortable and improves air quality. Prevents mold and mildew. Ideal for Marine applications. Inhale freshness to your heartÆs content. And like all great Sunsei «products, the Solar Vent is naturally powered by the sun. Works on rigid or flexible surfaces like fiberglass, wood, glass, plastic, metal, canvas, nylon or PVC. Like all rugged Sunsei« products, itÆs weather-resistant and built with premium stainless steel. Rough seas or rain? No problem. Just close the ventilation shaft from inside and stay dry. With a flick of the control switch you can shift from Intake to Exhaust to Off. Aesthetic buffs rave how the compact Sunsei« Solar Vent blends in seamlessly to your boat. Weighing in at only 2.5 pounds, with an exterior cover diameter of 10.5", a total height 6" and a vent diameter 4" , youÆll hardly even notice itÆs there. This product delivers a turbo-like airflow of 1,000 ft^3 (28m^3). Can run for 48 hours without sunlight. Easy to install - No wiring required.