MaxxAir Original Vent Cover. The Original mounts on most popular 14in x 14in 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. 19.5in L x 18.5in W x 9in H. Smoke. Warranty limited to repair or replacement, see vendor's website for details.