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The unit will run on natural gas or LP gas, but it has been factory set to run on natural gas. Section 1 — General Information Bryant Air-cooled 7 kW, 12 kW and 15 kW Generators Should the primary fuel need to be changed to LP gas, the fuel system needs to be reconfigured. See Section 1.9 for instructions on reconfiguration of the fuel system. Recommended fuels should have a Btu content of at least 1,000 Btus per cubic foot for natural gas; or at least 2,520 Btus per cubic foot for LP gas. Ask t