I have had the Rosewill Thor V2 case and I have had the stock fans in it since I got it around Christmas. I will put the fans that are supported below:
-Front 1 x 230mm Red LED Fan (pre-installed)
-Rear 1 x 140mm Fan (pre-installed)
-Top 1 x 230mm Fan (pre-installed) or 2 x 120 / 140mm Fan (option)
-Side 1 x 230mm Fan (pre-installed) or 4 x 120mm Fan (option)
-Bottom 1 x 120/140mm Fan (option)
I was just curious as to the best way to arrange these fans to get the best airflow possible. If new fans need to be bought, that is no problem whatsoever.
front - intake
rear - exhaust
top - exhaust
side - intake unless split then it's usually intake on the GPU. CPU can either be left alone, be intake or exhaust depending the cooler. often it's best to play around with side fans as the specific gpu/cpu coolers vary results with arrangements. i've found some cases actually increase temp with any side fans.