The Fantastic Vent Fans as well as the Endless Breeze Fans are strictly 12-volt. These fans are quite remarkable - - they move a tremendous amount of air quietly and quite efficiently. I have two of the Fantastic Vent Fans that were installed by factory representatives on my '64 Overlander at the WBCCI International Rally in Dayton, OH (1999) - - the fans have the rain sensor, thermostat, and are three-speed revversible. The installed cost for the pair in 1999 was less than $350.
The Endless Breeze Fans are basically the Fantastic Vent Fans mounted in a box that can be moved anywhere in the coach where a 12-volt "cigar-lighter-style" outlet is available. They have been absolutely fantastic in helping to keep my Chihuahuas comfortable while attendint International Rallys. With the combination of Fantastic Vents and the Endless Breeze Fans, my Overlander has been quite comfortable under most conditions.
You can learn more about Fantastic Vent Fans at:
Fantastic Vent Fans
Good luck with your decision!