justcallmetom13 :
Is is possible, or even practical do stack 2 fans?
Will it increase airflow?
I want to stack 2 180mm fans.
Yes and no. Putting two fans together does not increase the maximum airflow of the fans. So if you have a fan that pushes 50cfm in a theoretical, no resistance situation, putting two of them together will still only push 50cfm. What stacking can do though is help overcome resistance to the fan. It is common practice among water coolers to stack fans to help overcome the resistance of the radiator that the fans are blowing air through.