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Portable extinguishers: units per floor
Choose the fuel type and hazard and enter the floor area. The tool gives units per floor, the minimum rating and the maximum travel distance.
Quick answer
7 ABC powder units rated ≥ 3A per floor, 14 in total; travel distance to the nearest unit ≤ 20 m.
Preliminary results
Per floor7units
Total units14units
Min. rating3A
Travel distance≤ 20m
| Step | Result | Basis |
|---|---|---|
| Table by hazardMedium (shops, workshops, ordinary stores) | 3A · 150 m² · 20 m | TCVN 7435-1:2004 §7 ⚠ |
| By area⌈1,000 / 150⌉ | 7 units | TCVN 7435-1:2004 §7 ⚠ |
| Minimum per floormax(7; 2) | 7 units | TCVN 7435-1:2004 §7 ⚠ |
| Total units7 × 2 | 14 units | — |
- Place units visibly and accessibly, near exits along travel routes; not behind doors or in closed cabinets.
- Electrical rooms, panels, server rooms: add CO₂ units.
- Floors under 100 m² with solid fuels may have 1 unit.
Sources and assumptions. TCVN 7435-1:2004 clause 7 (Table 1 solids, Table 2 liquids): rating, travel distance, maximum area per unit; at least 2 units per floor; provision per QCVN 10:2025/BCA section 2.6 and TCVN 3890:2023 ⚠. ⚠ = code table value to be checked against the original standard. Preliminary results for material selection and budgeting; not a substitute for an approved fire protection design.
Suggested materials
ABC powder extinguisher rated ≥ 3A (4 kg or 8 kg)14 units
CO₂ extinguisher 3–5 kg for electrical roomsper drawing
Extinguisher stands, wall bracketsper drawing
Instruction signs, fire orders14 units
Extinguisher placement table
| Fuel | Hazard | Rating | Travel ≤ | Area per unit ≤ |
|---|---|---|---|---|
| Solids (wood, paper, textile, plastics) | Low (offices, classrooms, homes) | 2A | 20 m | 300 m² |
| Solids (wood, paper, textile, plastics) | Medium (shops, workshops, ordinary stores) | 3A | 20 m | 150 m² |
| Solids (wood, paper, textile, plastics) | High (combustible stores, paint, woodwork) | 4A | 15 m | 100 m² |
| Flammable liquids, gases (fuel, paint, LPG) | Low (offices, classrooms, homes) | 55B | 15 m | 300 m² |
| Flammable liquids, gases (fuel, paint, LPG) | Medium (shops, workshops, ordinary stores) | 144B | 15 m | 150 m² |
| Flammable liquids, gases (fuel, paint, LPG) | High (combustible stores, paint, woodwork) | 233B | 15 m | 100 m² |
Frequently asked questions
How many extinguishers for a 1,000 m² workshop?
Medium hazard, solids: max 150 m² per unit → ⌈1,000/150⌉ = 7 units rated ≥ 3A, travel distance ≤ 20 m.
How many for an 80 m² office?
Floors under 100 m² with solid fuels may have 1 unit; add a CO₂ unit if there is electrical equipment.