akisunni
New Member
Well I have a 4*4*7 feet grow tent I made. It has an bottom intake and an exhaust fan cycling the air 2-3 times a minute. Now that I think of it im not sure it adding CO2 would make any difference as it would stay for very little in the grow tent.
The cost to run a CO2 engine is only a few dollars. I would guess its in the $10 to setup and maybe $3 per month in supplies, if that. CO2 is heavier than air, so having it fall from the roof and be blown around will get help the grow capacity. It cant hurt at tent volumes, but it can help.