You use a timer or CO² controler to regulate the gas and you use an exhaust fan with a damper to remove the air from the room at pre-timed intervals.
Zandor Reviewed by Zandor on . Co2 tank hey i'm going to buy a co2 tank but i have a question ... do i need a regulator to get co2 into the my grow box or could i just put the tank in the box and put it on a low presure so it comes out constantly ? what would work ???? Rating: 5