I have a practical engineering problem for which I really have no background on how to solve. I am looking for help, but don't even know what field of engineering would be likely to know the answer, so not quite sure where to ask. Any formulas that I might use to calculate the answer would also be useful. My problem is this: I have a closed space with known volume, inside which some machinery is computing X Btu/hr. I want to get rid of this heat by putting an exhaust fan in the ceiling. Obviously I would also need an intake vent that is rated for the same airflow as the exhaust fan. My question is, how do I calculate the required Cubic Feet per Minute (CFM) of the fan that would be necessary to dissipate the generated heat? I presume this would also depend somewhat on the ambient air temperature, pressure, and humidity. Any help would be greatly appreciated. Thanks!