The streamlined XLT Roof Vent Cover features an aerodynamic design and durable construction. The oversized vent cover is UV resistant and allows more air flow than standard vent covers. It also allows more room to open and close your RV vent lid. Works great with fan powered vents. Camco Roof Vent Cover has pivoting louvers on the grate which allow for easy access to the inside of the cover, making it easy to clean. Fits most mounting brackets.