Case fans are supposed to cool your case. As use in this review, a case fan is a fixed-voltage fan. Today we might want to call them non-PWM fans. These fans are “set ‘em and forget ‘em” fans. Except that some of you insist on using fan controllers to vary the speeds of your fans. Imagine that! Well, in any case (in any case – get it?) we’re going to look at more than twenty case fans. I say “more than twenty’’ because I can’t count. We have more than 30 fans and settings that we will be looking at today. If you are interested in counting actual fans, be my guest.