Brewing Beer for CO2

I am not actually expecting a giant return from brewing, but it cant hurt so i have it set right outside my flowering closet. It is sitting on 2x6 blocks above an AC duct. Then i put a box over the top of it with for a cool tube effect to keep the fermentation from getting everything too hot. You can feel a nice cool breeze coming out by the airlock

first batch in like 10 years. it is a honey ale....so almost a mead i guess. I am running 4 autos right now. 2 are like 4 days old and 2 are at a month. They have been flowering for about a week and a half so I just switched my MH bulb to the HPS