Atwood 800500 EZ Breeze Static Vent Class-leading 350 CFM whether in exhaust or ceiling fan mode, which is up to 3.5X more than other vent fans in its class Fresh air is circulated through opening and closing ventilation tabs inside the fan without ever raising the dome, allowing enjoyment of the EZ-Breeze rain or shine Uniquely designed with a built in rain cover to provide air circulation throughout the RV without ever needing to open the dome Revolutionary design gives RVers peace of mind when away from the coach that fresh air is being exchanged rain or shine