This Ventline Vent has a 12V DC motor making it able to power a fan for faster air delivery. It also has extra strong galvanized steel roof flanges in a painted white finish and mounts onto the roof of your RV with screws. The dome is also white with an aerodynamic design. The screen frame also has radius corners and consists of two removable pieces. The 12V fan is controlled by an on/off switch fitted to the vent.