Your case fans are 120mm.
Fan noise comes from the rpm they are running at, not so much the brand or fan design.
Changing out fans for lower rpm units will reduce your cooling.
I might suggest you first experiment with slowing down your current fans.
There are cheap parts that will do this like the zalman fanmate http://www.newegg.com/Product/Product.aspx?Item=N82E16835118217
If your fans are connected to the motherboard, your motherboard may have some fan controls.
Or try speedfan, a free utility.
The case only takes 120mm fans so all of your fans are 120mm.
You are much nicer then me, I will gladly help others with problems or if they need some expert/experienced suggestions, but not help them be too lazy to do a very simple search, or in this case he could have even just used a ruler.
Your case fans are 120mm.
Fan noise comes from the rpm they are running at, not so much the brand or fan design.
Changing out fans for lower rpm units will reduce your cooling.
I might suggest you first experiment with slowing down your current fans.
There are cheap parts that will do this like the zalman fanmate http://www.newegg.com/Product/Product.aspx?Item=N82E16835118217
If your fans are connected to the motherboard, your motherboard may have some fan controls.
Or try speedfan, a free utility.
The case only takes 120mm fans so all of your fans are 120mm.
You are much nicer then me, I will gladly help others with problems or if they need some expert/experienced suggestions, but not help them be too lazy to do a very simple search, or in this case he could have even just used a ruler.