Hydrofarm ExHale XL CO2 BagProduct Details The XL ExHale CO2 Bag is for medium to large grow spaces. The XL will provide a 6x6 foot or 288 cubic foot space with CO2 for 6 months guaranteed. The XL ExHale comes with a freshness seal that doubles as a hanger. Steady supply of CO2 for 6 months guaranteed Maintenance free No heat No electricity Patent pending genetics Suitable for Organic Production Made in the USA How to Use ExHale ExHale comes complete, simply follow the