Blueprint Controllers CO2 Generator LP High Altitude 8-burnerThe Blueprint Controllers CO2 Generator LP High Altitude, CGLP 8H is designed for altitudes greater than 4,500 feet above sea level and features eight preinstalled brass burners that generate 16. 7 cubic feet per hour of CO2 using liquid propane. The generator includes plugs to reduce the number of active burners, making it easy to reduce the CO2 and heat output to suit a smaller growing space. Electronic ignition and dual solenoid valves eliminate