Blueprint Controllers CGNG-8 CO2 Generator NG High Altitude, 8-burnerFeatures eight preinstalled brass burners that generate 20. 1 cubic feet per hour of CO2 using natural gas Designed for altitudes greater than 4,500 feet above sea level Features electronic ignition and dual solenoid valves, which eliminate the open pilot flame and provide safe, reliable starts. This unit includes a gas regulator, 12 foot hose, hanging hardware and a three year warranty Designed specifically for use in high altitude locations above