This Autopilot APCG8NGH CO2 natural gas burning CO2 generators are the most effective way of producing CO2 for fast and healthy plant growth. As a primary environmental factor in greenhouses, it provides 11 cubic feet per hour of CO2 for spaces 14 foot x 14 foot and larger. It has a solid state electronic ignition module that eliminates the open pilot flame. No pilot light necessary! This generator comes with a standard tip over safety switch that will shut down the fuel in the event the unit falls or tips over making it the safest most reliable CO2 generator on the market. Includes hanging hardware kit (20-inch chains, screw hooks, and S hooks).