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When gas begins to flow from the pressurized manifold through the valve that has just been turned on, it begins mixing with air in a "space" called a venturi. The gas and air are flamable, but the mix has yet to be ignited. The gas/air mixture "tumbles" along in the delivery conduit until it comes out the little holes in the burner itself. Recall it is yet unignited. The fuel/air mix reaches the piezoelectric (spark) ignitor or the pilot light, and the "ready-to-go" mix is suddenly ignited. The flame front quickly travels back along the outrushing mixture until the "flame base" is established at the little holes in the burner itself. That "backward rushing" flame front leaving the ignition source is moving very quickly. The fuel/air mixture burns so fast it actually creates a mini-explosion, and the shockwave makes the poof! as the burner comes on.

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17y ago

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