Fire extinguisher calculator: how many extinguishers per floor
Enter the floor area, the hazard class and the Class A rating printed on the extinguisher label (for example 2-A, 3-A, 4-A or 6-A). The result is the minimum count per floor for ordinary combustibles under NFPA 10, which SBC 801 applies through Section 906.
Also check travel distance: no point on the floor may be more than 22.9 m (75 ft) of walking distance from an extinguisher, so long or divided floors often need more units than the area result.
Kitchens with cooking oils need a Class K extinguisher, and areas with flammable liquids or electrical rooms need Class B or CO2 units sized separately.
NFPA 10 limits used
| Hazard | Minimum rating | Max floor area per A unit | Max area per extinguisher | Max travel distance |
|---|---|---|---|---|
| Light | 2-A | 279 m² 3,000 ft² | 1,045 m² 11,250 ft² | 22.9 m |
| Ordinary | 2-A | 139 m² 1,500 ft² | 1,045 m² 11,250 ft² | 22.9 m |
| Extra | 4-A | 93 m² 1,000 ft² | 1,045 m² 11,250 ft² | 22.9 m |
Source: NFPA 10, Table 6.2.1.1 (Class A); Saudi Fire Code SBC 801, Section 906. The Civil Defense review and the approved design decide the final number and locations.
Need it done on site?
AZEIDK engineers can survey your facility, size the system and handle supply, installation and Civil Defense paperwork.
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