So basically I had an early question and found out that if I have 15 machines running at 80 dB in a room it should end up being around 10*Log(15(10^7.5)) dB approx. 91.76 dB.
But how would the room size and the dispersion of the machines affect this number? As well as distance from the machines.
Edit: You can assume the machines run at a constant 75 dB and have the sound/pitch of a computer fan. For the sake of trying to find a general formula you can assume any other variables in your answer as long as you explain them.
Edit: I understand that there may be many more variables that come into play when determining the sound intensity in a room. But I am trying to find a rough estimate.