The Blueprint CO2 Generator For those who have a natural gas hook up, the CGNG-2 model is for you. If features 2 burners that generate 5.4 cu ft/hr of CO2. If you are using a propane tank or a propane source, get the CGLP-2 model. This also features 2 brass burners and can generate up to 5.3 cu ft/hr of CO2. If you have a smaller grow room, you are in luck. The second burner on each of these models is removable which will cut down on CO2 output as well as the heat output. You also get the convenience of an electronic ignition and duel solenoid valves. This mean a dependable start every time and no need for an open pilot light. Stay safe with a tip-over switch that will stop gas flow to the burners if the unit falls over or is not placed upright. Included with these generators is: A gas regulator 12' Hose All hardware needed to hang the generator AC power supply 3 year manufacturers warranty.