I am trying to calculate the required CFM (RCFM) for the area 10x5x6 with 7kW of power in it.
My calculations are:
V = 10x5x6 = 300 ft3.
BTU = 7000x3.41 = 23870
Air changes per hour (ACH) in data centers is suggested to be 50, so
RCFM = 300x50/60 = 250CFM

The problem here that 50 ACH I found in some guides "how to build a data center", so there was no really explanation where this number comes from.
I think ACH should be calculated somehow with using BTU.
And second of all 250CFM doesn't seem enough for 300 ft3 and 7kW.

Any advise if my calculations are correct and how to connect CFM with BTU please?