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The gas orfice when operating creates a vacuum drawing combustion air into the burner. This is the reason that gas pressures vary between types. Natural gas appliances operate at a nominal 3.5" wc pressure, while LP appliances run 10-11" wc. Natural gas has about 1000 btu's per cubic foot, while LP gas has about 2500. As an example, if you were to reduce the manifold pressure of LPG, you would have an oxygen starved mixture that would not burn properly. lc

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Q: How does the air gas mixing chamber of a fireplace log lighter work?
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