The overall exterior dimensions including the hinge are 11-5/8" square and protrudes 5/8".
The interior dimensions are 11" square and protrudes 1-5/8".
Because it is designed to go through walls no less than 2-1/2" thick, you may have to build a 1" deep collar or shim on the interior if you have 1-1/2" thick walls, like on Airstreams. Instead of building a collar, some customers have modified the fan housing itself to make it somewhat shallower. Using either method, the unit will look very nice when finished.
The fan motor is 110VAC only.
Both versions of this fan have interior grilles painted white. You have two options for the exterior: