The Maaxair RV roof vent cover keep the rain away from the inside of your coach. The vent cover contains the Maxxair’s zero-leak mounting system. The Maaxair RV roof vent features a translucent white, tough polyethylene cover with UV inhibitors, designed for durability. The Model 800 includes a screen and louvers for protection against blowing rain, insets, twigs and leaves. This RV roof vent cover comes with a 3 year manufacturer’s limited warranty and is designed for use with other fan-powered vents. Dimensions: 32″L x 19″W x 9″H.