Are the associated floors separated from the atrium by fire-resisting construction?
Fire engineering analysis required or reconsider degree of openness
No Is the smoke control provided by either atrium de-pressurization or pressurization of associated floor areas?
Go to figure 3e
Is the atrium pressurized in accordanceNone with BS 5588: Part 4?
Go to figure 3d
Figure 2b â€” Occupancy category decision process
ÂŠ BSI 8 December 2004