CO2 Controller for Mushroom Farms & GrowersCO2 Controller for Mushroom Farms & Growers Product Overview: The CO2 Monitor & Controller for Mushroom Farms and Growers automatically exhausts grow room air when carbon dioxide (CO2) levels get too high. Accurate CO2 Control Simple to Install and Use Easy Fresh Air Calibration The CO2 Monitor & Controller for Mushroom Farms and Growers lets you set a target CO2 level. Using advanced hysteresis logic, when the CO2 level in the grow room goes above