File:Fse-smouldering-to-flaming-transition-v2.svg

Fse-smouldering-to-flaming-transition-v2.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)

Summary

Smouldering in the crevice between the seat and back cushions of a chair. Extra air, a larger smouldering zone and a concave front raise the temperature and the gas production until the gases can ignite. Based on Ohlemiller (2002), pp. 2-207 and 2-208.

Original illustration for Smouldering-to-flaming transition, level 4 Expert.

Source basis: Ohlemiller (2002), p. 2-207 (chimney-like effect in the crevice between horizontal and vertical cushions, from mock-up studies) and p. 2-208 (requirements for transition; factors: enhanced oxygen supply, increase in scale, concave smoulder front; secondary char oxidation fronts)
Alt text: Side section of an armchair seat and back cushion with a glowing smoulder zone in the crevice, air flowing in and gases rising.

Licensing

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:12, 2 November 2026		900 × 600 (8 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Smouldering-to-flaming transition

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Short title	Smouldering in the crevice between the seat and back cushions of a chair. Extra air, a larger smouldering zone and a concave front raise the temperature and the gas production until the gases can ignite. Based on Ohlemiller (2002), pp. 2-207 and 2-208.
Image title	Side section of an armchair seat and back cushion with a glowing smoulder zone in the crevice, air flowing in and gases rising. Source basis: Ohlemiller (2002), p. 2-207 (chimney-like effect in the crevice between horizontal and vertical cushions, from mock-up studies) and p. 2-208 (requirements for transition; factors: enhanced oxygen supply, increase in scale, concave smoulder front; secondary char oxidation fronts)
Width	900
Height	600