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Table 4 Risk classification table for flashover propensity (x), total heat release (y), and smoke toxicity potency hazard (z).

From: Moisture Content, Ignitability, and Fire Risk of Vegetation in Vertical Greenery Systems

x (kW m−2 s−1) y (MJ m−2) z (m3 kg−1)
Classification Range Classification Range Classification Range
Low 0.1 to 1.0 Very low 0.1 to 1.0 Low 0.0 to 1.0
Intermediate 1.0 to 10 Low 1.0 to 10 Intermediate 1.0 to 10
High 10 to 100 Intermediate 10 to 100 High 10 to 100
   High 100 to 1000 Very high >100