The FAMCO CRV Continuous Ridge Vent - Provides optimal ventilation when used with proper soffit venting. The Continuous Roof Vent eliminates the "spotty" ventilation found with other types of gravity vents. The CRV features low silhouette and weather tight construction. For commercial or residential applications. Provides the most ventilation for the least cost. Vents at the roof ridge to remove heat and moisture. Vent louvers are protected from rain and snow.