Quote Originally Posted by MtnLionCO
2 high speed fans is all you would need and some ducting, 10 inch can fans.
Why wouldn't you run the CO2 in the grow room? Why would you run it all the way from the basement to the upstairs? If your grow room wasn't sealed, then you would be filling the house up with CO2. That would be a waste, right? That seems like a lot of extra work and money.

I think dangerous levels of CO2 for humans starts around 10000ppm. Even still, that doesn't seem like it would be good for your health.