co2 question.

I have a grow tent and was wondering if i run Co2 will i still need to suck fresh air in? And push air out?

Thanks

anyone know?

You only run CO2 for A short length of time every day, otherwise with ventilation running it would be almost immpossible and expensive to keep the CO2 levels at 1500ppm.

You turn off ventilation for this time period

thanks ganjaG