Co2 Diy

You get roughly 20x the volume of CO2 as what you are fermenting for an average 1.060 gravity beer. This of course depends on the gravity of what you are fermenting. A higher gravity has more fermentables and will produce more CO2. So, if you ferment 100 liters of beer that has a 1.060 starting gravity you will get about 2'000 liters of CO2. The next question is your exhaust fan and room. Do you have a grow tent within the room so the exhaust fan exhausts into the 8x8 room? If so then the CO2 produced would mostly stay in the room and the CO2 increase could be notable while fermentation is happening... Unfortunately fermentation is usually pretty quick with the bulk happening in about 2 days. Are you up to fermenting 80-100 liters every 2 or 3 days? If your exhaust fan is blowing air out of the room then I think it will blow out the CO2 as fast or faster than it is produced so you probably won't get much increase in the CO2 concentration within the room.