Sam, yours should be ok as long as the desk isn't pushed up against the wall where it opens in the back. Can't tell from the pic. Give it at least 4-5 inches to exhale that hot air or you'll just draw it back into the system when that small space fills up. Check out my shots, you'll see just how open my system is. My case and fan setup have my internal system temperature just 4c over ambient. Give em room to breathe!!
And keep several cans of air duster handy, stuff is a life saver!!