Exhale Original CO2 BagExhale Homegrown CO2 Premixed Ready To Use Bag For Grow Rooms Tents With Hanger The Original ExHale CO2 Bag produces CO2 24 hours a day with no need to refill bottles or use expensive CO2 production units. The power of ExHale lies in the mycelial mass inside the vented bag. This mycelial mass produces CO2 and the microporous breather patch releases CO2 continually for at least 6 months. On average our CO2 bags will raise the CO2 level by 500 ppm above