Maxxair 503.15 (00-933066) White Vent Cover Maxxair Original Vent Cover ; Sleek, aerodynamic design reduces wind resistance The Original mounts on most popular 14 inch x 14 inch standard roof vents, and features the exclusive Zero-Leak Mounting System that eliminates the need to drill any holes in your RV's roof surface Six-year Limited Warranty. Angled louvers on the back of the cover allow smoke, odors, and stale air to escape ;Removable bug screen behind the louvers helps keep out insects and debris 19.5 inch Length x 18.5 inch Width x 9 inch Height White.Note: not recommended for use with high-powered vent fans Maxxair Original Vent Cover ; Sleek, aerodynamic design reduces wind resistance The Original mounts on most popular 14 inch x 14 inch standard roof vents, and features the exclusive Zero-Leak Mounting System that eliminates the need to drill any holes in your RV's roof surface Six-year Limited Warranty. Angled louvers on the back of the cover allow smoke, odors, and stale air to escape ;Removable bug screen behind the louvers helps keep out insects and debris 19.5 inch Length x 18.5 inch Width x 9 inch Height White