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- TL;DR Summary
- If a fan is pumping in fresh air (400ppm CO2) at 50 CFM into a space that is 500 CF , another fan is pumping out the air of the space at 50cfm, and the space is currently 2000ppm, how long will it take to reach 1000ppm CO2?

would this be a quadradic equation since its dealing with half life? I think in 500/50 = 10 minutes, the fan would have brought 500 CF of fresh air, but the out fan would have been taking out the same amount of air which includes the fresh air, so at 10 minutes, it should have less then half the average CO2 ppm between the two. so it should be less than (2000+400ppm)/2 = 1200 ppm, but how much exactly?

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