Gen-1 Liquid Propane CO2 Generator. Gen-1 Carbon Dioxide Generator. This propane powered co2 generator comes with one burner and its output is 3 cubic feet per hour. Three more burners may be added to increase the co2 output to 12 cubic feet per hour. Burners may be added one at a time to increase co2 output. Each burner will emit 3.1 cubic feet of co2 per hour. Safety features include a tip-over switch and main burn... — Ships separately from Portland, Oregon USA....more info.