File:Fse-critical-velocity-v4.svg

Fse-critical-velocity-v4.svg (SVG file, nominally 900 × 600 pixels, file size: 7 KB)

Summary

Opposed airflow at an opening between a communicating space and an atrium. The average velocity must reach the minimum everywhere in the opening and should not exceed 1 m/s. Based on Milke (2002b), p. 4-307.

Original illustration for Critical velocity, level 4 Expert.

Source basis: Milke (2002b), p. 4-307 (opposed airflow, minimum velocity at all points, turbulence at edges and corners, plume along the atrium wall, 1 m/s limit)
Alt text: Section of an atrium wall with an opening; air flows out of the side space into the atrium against a plume rising along the wall.

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 (7 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	Opposed airflow at an opening between a communicating space and an atrium. The average velocity must reach the minimum everywhere in the opening and should not exceed 1 m/s. Based on Milke (2002b), p. 4-307.
Image title	Section of an atrium wall with an opening; air flows out of the side space into the atrium against a plume rising along the wall. Source basis: Milke (2002b), p. 4-307 (opposed airflow, minimum velocity at all points, turbulence at edges and corners, plume along the atrium wall, 1 m/s limit)
Width	900
Height	600