We back up these testimonials with our UL certifications and wind pressure testing. Our Aura Vents, Round Back Vents, Pop Vents, Keepa Vents, and Universal Vents have UL certifications. They're tested to wind pressures of 50+ PSF, equivalent to over 200 mph wind speeds! These vents also exhaust air passively, so there’s no need to worry about moving parts that need replacement or repairs after wear and tear. Roof vents leaking will no longer be a problem with Active Ventilation Products!