I know this thread is super old, but just in case you haven't checked yet.... I would expect it is. I added fans to our kitchen and the bunkhouse. I didn't add one to the bunk bath yet, as I added the fantastic fans with remote, rain sensor, and power dome. They set me back almost 600 bucks for the two, and I couldn't afford to do a 3rd yet. The bunk and the kitchen were both prewired. If you want to know for sure, it's 4 screws and 5 minutes to find out. Remove the inner bezel around the vent, and you should be able to see with a flashlight if there are wires there. Ours is a 2012, and was prewired.
Loving our Sierra 365SAQ
Nights camped so far in 2016 = 0
Although Many trips scheduled.