File:Fse-critical-velocity-v2.svg

Fse-critical-velocity-v2.svg (SVG file, nominally 900 × 600 pixels, file size: 23 KB)

Summary

Critical velocity to prevent smoke backflow in a corridor from Thomas's relation, for five heat release rates. Based on Klote (2002), pp. 4-279–4-280.

Original illustration for Critical velocity, level 4 Expert.

Source basis: Klote (2002), pp. 4-279–4-280 (Equations 4 and 4a; Figure 4-12.8(b) shows 500 to 2,000 kW: redraw from the formula, do not copy that figure); Van Rossum (2027), §4.5
Alt text: Line chart of critical velocity falling with corridor width for five fire sizes from 150 kW to 2.5 MW.

Licensing

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:33, 2 November 2026		900 × 600 (23 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Critical velocity

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Short title	Critical velocity to prevent smoke backflow in a corridor from Thomas's relation, for five heat release rates. Based on Klote (2002), pp. 4-279–4-280.
Image title	Line chart of critical velocity falling with corridor width for five fire sizes from 150 kW to 2.5 MW. Source basis: Klote (2002), pp. 4-279–4-280 (Equations 4 and 4a; Figure 4-12.8(b) shows 500 to 2,000 kW: redraw from the formula, do not copy that figure); Van Rossum (2027), §4.5
Width	900
Height	600