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Lower explosive limit (LEL) the lowest concentration of a flammable gas or vapor in air-expressed as a percentage-that is capable of producing a flash of fire in the presence of an ignition source. For methane, the flammable component found in natural gas, that’s 5%. Over my career as a home inspector and energy auditor, I’ve found many gas leaks, the majority of which I would consider non–life-threatening. However, yesterday that changed when I discovered a gas leak with LEL concentrations reac

Lower explosive limit (LEL) the lowest concentration of a flammab…

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