This is typical, but yiu should have noted how *your fans* were ordinated. Front chassis fans, blow-IN, rear fans, blow-OUT. HSF, usually blow-ON or down onto the cpu. However, if you have no directly mounted cpu fan, and is off or mounted elsewhere, usually that implies its trying to blow-OUT the chassis when connectewd to some sort of wind tunnel. When you look at fan blades themselves directly, they are usually blowing towards you. In better fans, a decal or embossed air shows the direction of flow.
1. Are chassis fans to blow in or suck out air?
2. Are cpu fans to blow or suck?
I just replaced my fans and I am just making sure I put them in the right direction.