File:Fse-trench-effect-v4.svg

Fse-trench-effect-v4.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)

Summary

Walls restrict the air entrained by a flame: a flame against a wall entrains from half of its perimeter, and walls and corners lengthen the flames. Based on Iqbal and Salley (2004), pp. 4-1 and 4-2.

Original illustration for Trench effect, level 4 Expert.

Source basis: Iqbal and Salley (2004), p. 4-1 (restriction of free air entrainment near walls and corners lengthens flames; wall flame entrains from half its perimeter) and p. 4-2 (corner fires more severe due to radiative exchange between burning walls)
Alt text: A fire in the open, against a wall and in a corner, with entrained air from all round, from half and from a quarter; the flames get longer.

Licensing

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:13, 2 November 2026		900 × 600 (8 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Trench effect

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Short title	Walls restrict the air entrained by a flame: a flame against a wall entrains from half of its perimeter, and walls and corners lengthen the flames. Based on Iqbal and Salley (2004), pp. 4-1 and 4-2.
Image title	A fire in the open, against a wall and in a corner, with entrained air from all round, from half and from a quarter; the flames get longer. Source basis: Iqbal and Salley (2004), p. 4-1 (restriction of free air entrainment near walls and corners lengthens flames; wall flame entrains from half its perimeter) and p. 4-2 (corner fires more severe due to radiative exchange between burning walls)
Width	900
Height	600