That Antec and others identical to it inside (Rosewill R6A series, Compucase 6A19 series, Tt Tsunami, etc.) take 120mm fans front and rear. The rear fan can be whatever thickness - the front fan is usually limited to 25mm thick for space reasons. Antec sometimes uses plastic fan cages to simplify installing fans - the cages are usually limited to 25mm fans so if you want to use a thicker fan, you have to ditch the cage and use screws or rubber pins to mount the fan.
Those cases usually come with one 25mm fan in the rear which you can move to the front and use whatever else in the rear.
.bh.