I currently have in my possession three beautiful SilverStone Custom Designed 180mm stock fans that were included with my SilverStone Raven RV02 ATX case. These three 180mm fans have been used in an enthusiast hardware environment and were given the task of cooling two GeForce GTX 590s in Quad-SLI along with providing an abundance of ambient airflow to the Raven RV02.
By chance, would you know the maximum CFM of these fans? Are they 3-pin (it looks like it in the picture, but difficult to tell)?
No way of knowing the exact CFM on these, as SilverStone never provided that specification neither online nor in the paper manual. Of course, CFM and static pressure are going to be variable by RPM speed, and based on experience I can estimate that these are within the 90 - 100CFM range (don't quote me on that). All in all, this particular design was chosen by SilverStone for its first 90-degree ATX chassis (which I have reviewed), and the airflow is plenty and very abundant.
But to answer your other question, yes they are 3-pin.