The first two minutes of a fire are critical. Before sprinklers activate and before the fire department arrives, the only tool to knock down a small flame is the portable fire extinguisher. NFPA 10 details type, capacity, placement, and maintenance. A practical field guide below.
Fire Classes
- Class A: Paper, wood, textile. Water, ABC dry chemical.
- Class B: Flammable liquid (gasoline, solvent, oil). CO₂, BC dry, AFFF.
- Class C: Electrical. CO₂, ABC dry (no water).
- Class D: Metal (magnesium, lithium). Special dry chemical.
- Class K: Cooking oil (kitchen). Wet chemical.
Rating System
The label (e.g., "4A:80B:C") gives per-class capacity:
- A rating: Class A capacity (1A = specific wood crib)
- B rating: Class B area in ft² (80B ≈ 80 ft², about 7.4 m², of flammable liquid fire)
- C rating: Electrical safety (non-conductive)
Typical office: 4A:80B:C (6 kg ABC dry).
Travel Distance
NFPA 10 maximum path to nearest extinguisher:
- Class A Light Hazard: 75 ft (23 m)
- Class A Ordinary Hazard: 75 ft (23 m)
- Class A Extra Hazard: 50 ft (15 m)
- Class B: 50 ft (15 m) in fuel storage, 30 ft (9 m) at fryers/process lines
- Class K: 30 ft (9 m)
Placement
- Visible and accessible
- Top of extinguisher ≤ 1.5 m from floor (≤ 18 kg)
- Heavy (>18 kg): ≤ 1.07 m
- Near exits (quick access + visibility)
- Beside fire alarm panel typical
Maintenance Frequency
- Monthly visual: Pressure gauge, seal, physical damage. Non-certified staff can do it.
- Annual service: Certified technician, internal check.
- 6-year service: Cylinder opened, powder replaced, internal corrosion checked.
- Hydrostatic test: Cylinder pressure test every 5 or 12 years depending on type; units that fail are removed from service.
Common Problems in Turkey
- Expired units: 6- and 12-year overdue, still hanging.
- Gauge in red: Unnoticed for years.
- Behind desks: Unreachable.
- Only present at inspection: Moved back to storage after audit.
Conclusion
Extinguishers are cheap but life-saving. Right type, right place, proper maintenance — a big difference in the first two minutes. Applied with discipline in the field, NFPA 10 would let most restaurant fires be put out before they leave the kitchen.
Extinguisher schedule in MEP Calc
Per-building extinguisher map, monthly check reminders, 6/12-year service schedule.
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Download SprinkCalc on the App StoreCore reference: NFPA 10 - Standard for Portable Fire Extinguishers. Original NFPA post: NFPA Today - Portable Extinguishers.