File:Fse-tunnel-fire-v1.svg

Fse-tunnel-fire-v1.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)

Summary

Airflow below the critical velocity (top): smoke flows back upstream against the air. Airflow at or above the critical velocity (bottom): the upstream side stays free of smoke. Based on Klote (2002), pp. 4-278–4-279.

Original vector illustration for Tunnel fire, level 2 Intermediate.

Source basis: Klote (2002), p. 4-278 (Figure 4-12.6, smoke backflow against low air velocity; redraw, do not copy) and p. 4-279 (critical velocity to prevent smoke flowing upstream)
Alt text: Two longitudinal tunnel sections with a burning vehicle: weak airflow lets smoke flow back upstream; stronger airflow keeps all smoke downstream.

Licensing

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:44, 2 November 2026		900 × 600 (8 KB)	Lisa (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Tunnel fire

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Short title	Airflow below the critical velocity (top): smoke flows back upstream against the air. Airflow at or above the critical velocity (bottom): the upstream side stays free of smoke. Based on Klote (2002), pp. 4-278–4-279.
Image title	Two longitudinal tunnel sections with a burning vehicle: weak airflow lets smoke flow back upstream; stronger airflow keeps all smoke downstream. Source basis: Klote (2002), p. 4-278 (Figure 4-12.6, smoke backflow against low air velocity; redraw, do not copy) and p. 4-279 (critical velocity to prevent smoke flowing upstream)
Width	900
Height	600