SunVent Stainless Steel Solar Vent Item#: 700-11332-00 A brilliantly simple way to ventilate boats, caravans, greenhouse etc. ... the applications are endless. This durable solar powered ventilator system is the perfect exhaust fan for many venting applications. Great for boats, vans, RV's, mobile homes, dog houses and more! Operates only when in direct sunlight. This solar vent extracts 680 cubic feet of air per hour under normal operation. For example, an RV that is 14 feet long, 5 1/2 feet wide and 6 feet high would take less than 45 minutes to completely change the air. To calculate a space you wish to vent, multiply length X width X height to get cubit feet. Divide cubic feet by 680 and then multiply X 60. The result is the number of minutes it would take to completely change the air in that space. The Stainless SunVent is waterproof and comes with a gasket and installs in a 5" diameter opening. The SunVent is a smart pollution-free, environmentally conscious solution to venting and cooling many outdoor enclosed spaces with solar exposure. Materials you will need: Screws, sealant, tools for cutting, etc. Shipping wt. 2.5 lbs