Shut your exhaust off when you release your co2 and leave it off for an hour afterwards. Run your line at the top of the canopy. Or run a line like this window->hood->fan->window. this way your only venting the heat from the light. But I believe your temps need to be a little higher for co2 uptake to be most effective. Hopefully someone will correct me if I'm wrong.
socialistpete Reviewed by socialistpete on . Co2 Question Okay basically i have a questions that hopefully someone can answer. I am running 2 grow tents in a sealed room with aircooled hoods that are hooked up like this: carbon filter --- > hood --- > fan --- > the air is exhausted out through the top of the tent back into the room. The fans are 530 m3/h (one per tent). I am not using an intake fan, its passive. Rating: 5