Exhale - Homegrown CO2 for Your Indoor PlantsBrand: ExHale CO2 Color: Original Version Features: FOR THE GROW TENT Designed for small to medium sized grow spaces. The original will provide a 128 cubic foot space with CO2 for 6 months guaranteed. READY TO USE ExHale comes complete and is cultivating CO2 even before you get out of the checkout line. Simply place ExHale in your grow space and leave it alone to do its job. EFFECTIVE CO2 DELIVERY A continuous shower of CO2 from the ExHale bag