"You have to use Carbon Filters like that when you are in a sealed environment running CO2 like me. "
You upgrade from opening the door to "Day Laborer CO2 Supplementation"???
What I referred to was a time of about 6 weeks, when I was not running CO2, where the only ventilation the plants received was from my opening or closing the door, and the only CO2 they received, was what came out of my lungs. I have since filled my tanks, and turned the CO2 back on (about 1.5 weeks ago).