Stupid fan question on build

[onrecess2]

My motherboard has case fan1 and 2, then one called pwr fan. I hooked up a fan controller to all 3 case fans and plugged them in to those. What is "pwr fan"? Is it just another case fan?
Thanks.

 

[evongugg]

Power fan is for the power supply fan. Your power supply may or may not come with a fan wire.

 

[onrecess2]

Oh, thanks. Seems obvious now, I never saw a psu that took a plug. Of course, I'm a total nube.
Thanks