File:Fse-vent-flow-v2.svg

Fse-vent-flow-v2.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)

Summary

Pressure inside and outside a fire room with an open door: above the neutral plane smoke flows out, below it air flows in. Based on Emmons (2002), pp. 2-34 and 2-36.

Original illustration for Vent flow, level 4 Expert.

Source basis: Emmons (2002), p. 2-34 (Equation 16 and Figure 2-3.4: pressure gradients on each side of a door), p. 2-36 (neutral axis where inside and outside pressure are equal); Van Rossum (2027), §3.2 (neutral plane, air in below, smoke out above)
Alt text: Left: room with hot layer and door, smoke out above and air in below. Right: inside and outside pressure lines crossing at the neutral plane.

Licensing

New drawing by Fire Safety Academy. © Fire Safety Academy.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:16, 2 November 2026		900 × 600 (8 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Vent flow

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Short title	Pressure inside and outside a fire room with an open door: above the neutral plane smoke flows out, below it air flows in. Based on Emmons (2002), pp. 2-34 and 2-36.
Image title	Left: room with hot layer and door, smoke out above and air in below. Right: inside and outside pressure lines crossing at the neutral plane. Source basis: Emmons (2002), p. 2-34 (Equation 16 and Figure 2-3.4: pressure gradients on each side of a door), p. 2-36 (neutral axis where inside and outside pressure are equal); Van Rossum (2027), §3.2 (neutral plane, air in below, smoke out above)
Width	900
Height	600