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I'm going to steal the images from my previous review of the NH-C12P SE14 as the installation is the same for the NH-C14, and uses Noctua's fantastic SecuFirm2 mounting system.
I'm going to perform a dummy install on the MSI P45 Platinum. This motherboard features a rather elaborate cooling set up that often interferes with installation of oversized heatsinks, so the ability to remove the bottom fan and gain clearance makes the NH-C14 a winner already.
The first part in an Intel installation is to get the back-plate set up. Basically, if you're using a Socket 775 motherboard, you'll want to make sure you have the rubber insert ... inserted. 1366, 1156 and 1155 set-ups can remove it. Then you put the hex headed bolts in the correctly marked holes (there is a guide engraved on to the back of the plate itself). The plate then goes on the back of the motherboard and through the mounting holes.
Next you place the black plastic spacers over the bolts. At this point you should offer up the heatsink and decide how you are going to orientate it on the board. In our case, we could mount it in all 4 directions perfectly fine on both the MSI P45 board and the MSI P55 board we tested with. The orientation of the cooler dictates the next part of the mounting installation.
The curved mounting bars attach to the bolts and are screwed on with the supplied thumbscrews. Tighten thumbscrews till they stop, and they do suddenly stop due to the way the mounting bars are designed, which is great because it removes any guesswork on your part.
The next part, according to the instructions is to mount the heatsink, which because of the fan clips, isn't a big problem. It's a little unweildy at times due to size and I did wish for a third hand but managed to install it fine, and both fans with the heatsink mounted (after removing my ram). I also found that I could mount the fans first and still install the heatsink fine by moving the fan fins out of the way and putting the screwdriver down through. My guess is, that at the very least, folks will want to leave the bottom fan in place while mounting the heatsink; adding it after installation, assuming you are doing it in a case and not outside of one, could be very tricky depending on the room you have and other local hardware getting in the way. Like the thumbscrews that attached the curved bars to the mounting bolts, the spring-loaded screws on the base can be tightened to the maximum; there is no guesswork involved, just simply tighten until done.
Total installation time the first time, in a Cosmos S case (modified with a hole cut out in the tray for mounting heatsinks on motherboards) was about 25 minutes, but that was purely because I've used the SecuFirm2 system before and didn't really need to read the instructions; you should probably allow at least 35 minutes for a first time, if not more.