EN 12845 classification for textile manufacturing, woodworking, tobacco, tyre manufacturing.
Definition
OH4 is the highest Ordinary Hazard category: 5.0 mm/min density over a 360 m² area of operation. Most occupancies that would qualify for OH4 are now classified as High Hazard Process (HHP) because of EU insurer practice.
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.