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Neutral plane

The interface between the hot gas layer above and the cooler ambient air layer below in a compartment fire. Above the neutral plane, pressure is positive relative to outside; below it, pressure is negative, driving air inflow at low openings.

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Related terms

BackdraftDeflagrationEquivalence ratio (phi)FlashoverFuel-controlled fireHot gas layerLow burn pattern (LBP)Ventilation-controlled fireVentilation factor

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