ExHale, The Original CO2 Bag

The Original ExHale is sized for small to medium grow spaces, up to 4 x 4 ft or 128 cubic feet. A living mycelium mass inside the bag gives off CO2 day and night, and a microporous patch lets it out continuously for at least 6 months. On average it raises CO2 about 500 ppm above ambient air.

There's nothing to refill and nothing to plug in. Hang it a little above the canopy, or near the fresh air intake if you run ventilation, using the freshness seal as the hanger.

Specs: suitable for organic production, made in the USA, 4.5 lb.