... of fully burning, safety guaranteed, and easy controlling. It uses propane or other gas to burn.NameCO2 GeneratorModelBurner-4Size(mm)400 ... *200*550Gas RequiredLPG, Propane, Natural gasGas ExhaustedGas combinedOutput of CO21.5kg/hArea Covered300-400M2Net ... 45-260V 50-60HZThermal Load4.5-7.5KW CO2 generator Propane ZCF01A-4 (4 burners)