The Blueprint Controllers® CO2 Generator NG High Altitude, CGNG-4H is designed for altitudes greater than 4,500 feet above sea level and features four preinstalled brass burners that generate 9.6 cubic feet per hour of CO2 using natural gas. 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 the open pilot flame and provide safe, reliable starts. A safety tip-over switch automatically stops gas supply to the burners if the unit is not upright. This unit includes a gas regulator, 12-foot hose, hanging hardware and a three-year warranty. It measures 15 inches by 8.5 inches by 18 inches.