Where should I put my Noctua NF-F12?

[BLUuuE]

I recently bought a single Noctua NF-F12 120mm fan but I dont know where to mount it. I have the CoolerMaster K350 case and no case fans installed apart from the pre-installed 120mm LED fan at the front. This is a rough drawing of the air flow in my case:

The green areas are where I can put the NF-F12 and the area in front of my 7850 is on the side panel case. Any ideas?

 

[oajarmeh95]

rear fan will push out any heat come from the heat sink or another components like the graphic card

 

[BLUuuE]

bump
Any more suggestions?