America's first choice in RV Ventilation Protects your RV's interior from rain Constant airflow prevents heat build up, lets must air, smoke and cooking odors escape. Proven, super-tough one piece design - Mounts to all standard roof vents. The original mounts on most popular 14"x 14" standard roof vents, and features our exclusive Zero-Leak Mounting System that eliminates the need to drill any holes in your RV's roof surface. Six-year limited Warrantly. 19.5"L x 18.5"W x 9"H