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EN 12845

Ordinary Hazard Group 2 (OH2)

EN 12845 classification for commercial laundries, car parks, bakeries — moderate fire load with larger compartments.

Definition

OH2 keeps the 5.0 mm/min density but increases the area of operation to 144 m². Practical effect: larger hydraulically most-demanding area, higher pump demand. Car park designs almost always sit at OH2 with K115 upright sprinklers.

Referenced in

  • EN 12845

Design it in FireTwin AI

Generate a compliant sprinkler layout, run the hydraulic calculation and export a priced bill of materials — checked against EN 12845 and NFPA 13.

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