Corsair 100r - Case fan questions.

After reading the directions in the manual I can install up to 2, 120mm or 2, 140mm fans in the front of the 100r. The case comes pre-installed with a 3-pin 120mm case fan in the back.

So my question is, can I replace the 120mm back fan with a 140mm fan? The manual didn't specify.

I was thinking about getting two 4-pin Noctua (grey and black type) fans. I know I want a 140mm for the front of the case. I just need to know whether a 140mm case fan will fit in the back of the case.

I'm choosing Noctua grey and black fans because of their modest cost and decent performance and appearance.

Do any of you have another case fan brand you would consider instead of the Noctua grey and black type of fans? Case fans with LED's are out of the question since this computer lives in my bedroom.
 
Solution
The rear can only fit a 120mm fan.

If you want another option, Phanteks makes some really high CFM fans for only $15-$20 each: www.phanteks.com/PH-F140SP.html