Hi - I don't think you mean CFM per computer, you mean BTUH per computer. What you should do is download the trial version of HVAC-Calc Commercial (t is included in the main download as long as you don't select "only for your own home") Download it here HVAC-Calc
Then, with the commercial program, I would enter it in as a lighting load. Find the wattage of each computer (roughly 200 watts but you should try to get it close since there are so many of them). If you want, after you download the program and play with it a bit, give me a call and I will show you what I mean. 1-888-736-1101
don