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Table 12 Percentage of fires where the design number of sprinklers was exceeded and where the fire was controlled by sprinklers, from 1967-1968 UK data reported by (Baldwin and North 1971 )

From: A review of sprinkler system effectiveness studies

Hazard Number of fires reported Design number of sprinklers Design number of sprinklers exceeded Controlled by sprinklers
Extra low hazard 30 4 23% 90%
Ordinary hazard 1 8 6 17% 88%
Ordinary hazard 2 91 12 9% 93%
Ordinary hazard 3 476 18 6% 95%
Extra high hazard 14 29 3% 79%