Fack that. I have a 4x8x7 tent, 224 cu ft. With 2800w in there, to keep it at 80F, I must run a 6" 440CFM exhaust blower and 2 4" 200cfm intake blowers.
What would be ideal, is 1 air exchange per minute. Mine does a complete exchange in 30 seconds. The more air exchanges, the faster your heat will be displaced, and your air won't stink. More air exchanges = less stale air. Keeps the smell down big time.
Also, for those of you that don't run Co2, co2 only makes up about 2% of the air. If you don't have a good air exchange, your co2 will be limited as well. Fresh air makes em happy as hell. Also, it will keep your RH down. (i pull outside air in, and its the middle of winter, so its dry and cold out there.