Fire Extinguisher Classes in India: A, B, C, D, F — Which One for Which Fire? (2026 Guide)
Walking into a fire safety store in India can be overwhelming. Dozens of extinguishers in different sizes, colours, and price points — but the most important question is often overlooked: Is this extinguisher rated for the type of fire that is most likely in my environment? Using the wrong class of extinguisher can be worse than using none at all. This guide explains the fire class system, the Indian colour coding standard, and exactly which extinguisher belongs where.
The Five Fire Classes (Indian Classification per IS 15683)
Class A — Solid Combustibles
What burns: Wood, paper, cloth, cardboard, plastics, rubber, furniture, textiles.
Where most likely: Homes, offices, schools, warehouses, retail stores, hotels, hospitals.
How extinguishers work on Class A: Cooling and quenching. Water or water-based agents absorb heat below the ignition temperature.
Suitable extinguisher types: Water, Water Mist, ABC Dry Powder, Foam (AFFF).
Unsuitable types: CO? (limited cooling effect — fire can re-ignite), Wet Chemical (designed for Class F).
Rating example: 4A, 6A, 8A, 13A (higher number = larger fire extinguished in test). A 4A-rated extinguisher can extinguish a 4A test fire (approx. 40 wooden sticks in a stack).
Class B — Flammable Liquids
What burns: Petrol, diesel, oil, paints, solvents, kerosene, alcohol, grease (non-cooking).
Where most likely: Petrol stations, workshops, paint shops, laboratories, vehicle parking, chemical storage, generator rooms.
How extinguishers work on Class B: Smothering (cut off oxygen) or chemical inhibition. Water is dangerous on Class B — can spread the burning liquid.
Suitable extinguisher types: ABC Dry Powder, CO?, Foam (AFFF/FFFP), Clean Agent (Novec 1230, FM-200).
Unsuitable types: Water, Water Mist (limited effectiveness), Wet Chemical.
Rating example: 21B, 34B, 55B, 89B, 113B, 144B, 233B (higher number = larger area of liquid fire extinguished in test).
Class C — Flammable Gases
What burns: LPG (propane/butane), CNG, methane, natural gas, hydrogen, acetylene.
Where most likely: Kitchen with LPG cylinder, industrial gas storage, laboratories, boiler rooms, petrol stations with LPG dispensers, vehicles with CNG.
Critical warning: On a gas fire, extinguish the fire only after shutting off the gas supply if safe to do so. If you extinguish the fire while gas is still flowing, unburned gas can accumulate and cause an explosion.
Suitable extinguisher types: ABC Dry Powder (most common), CO? (less effective on gas fires than dry powder).
Unsuitable types: Water, Foam, Wet Chemical.
Note: The Class C rating is not shown as a separate number — ABC dry powder extinguishers are rated "ABC" indicating suitability for Class A, B, and C fires.
Class D — Combustible Metals
What burns: Magnesium, titanium, aluminium (powder/fines), lithium, sodium, potassium, zirconium.
Where most likely: Metal workshops, foundries, aerospace manufacturing, battery recycling, chemical plants, laboratories.
Why Class D is different: Burning metals burn at extremely high temperatures (2,000–3,000°C). Standard extinguishing agents (including ABC dry powder) are ineffective or may react violently. Water on a metal fire can cause a steam explosion throwing molten metal.
Suitable extinguisher types: Specialised Class D dry powder (sodium chloride, graphite-based, or copper-based).
Very important: ABC dry powder is NOT rated for Class D fires. You need a specifically labelled Class D extinguisher.
Manufacturers in India: Limited — typically imported (Ansul Met-L-X, Amerex Class D). Cost: ?15,000–?50,000+.
Class F (also called Class K in North America) — Cooking Oils and Fats
What burns: Vegetable oils, animal fats, ghee, cooking oil (deep fat fryers).
Where most likely: Commercial kitchens, restaurant kitchens, hotel kitchens, canteens, food courts, home kitchens (especially large-scale cooking).
Why Class F is unique: Cooking oil fires behave differently — oil burns at temperatures above its auto-ignition point (~340°C for many oils). Applying water causes a violent steam explosion (splatback) that sprays burning oil. Standard ABC dry powder leaves a thick residue that contaminates food and kitchen equipment.
How Class F extinguishers work: Wet chemical (potassium-based solution) is discharged as a fine spray. The chemical reacts with the hot oil to form a foam blanket through saponification — turning the oil into a soap-like layer that seals the surface, prevents re-ignition, and cools the oil below ignition temperature.
Suitable extinguisher types: Wet Chemical (Class F/K) ONLY. Water Mist (some brands also suitable for Class F — check rating).
Unsuitable types: ABC Dry Powder, CO?, Foam, Water.
Mandatory in India: Under NBCS 2026, all commercial kitchens with cooking lines exceeding 4 metres must have a fixed automatic wet chemical suppression system (Ansul R-102 or equivalent). Portable wet chemical extinguishers (6–9 litre) are required as backup.
Home kitchen recommendation: Fire blanket (1m × 1m) for small oil fires, plus a 1–2 kg ABC powder for other fires (but not for oil fires).
Fire Extinguisher Colour Coding in India (As per IS 15683)
The entire body of the extinguisher is coloured to indicate the agent type. However, the standard is not always followed consistently by all manufacturers — always check the rating label.
| Extinguisher Type | Body Colour (IS 15683) | Common Alternate Colours Seen | Rated for Classes |
|---|---|---|---|
| Water (stored pressure) | Red with white band or all red with "WATER" text | All red (older extinguishers) | A only (not suitable for others) |
| Water Mist | Red with white band and "MIST" text | All red | A, sometimes F (check label) |
| ABC Dry Powder | Red with blue band | All red (common on cheaper units) | A, B, C |
| CO? (Carbon Dioxide) | Red with black band | Silver/metal body (very common), all red | B, C (limited A) |
| Foam (AFFF) | Red with cream/yellow band | All red with "FOAM" text | A, B (some also rated for F — check) |
| Wet Chemical (Class F) | Red with yellow band | Red with "WET CHEM" text | F only (primary), sometimes A (secondary)|
| Class D Metal | Red with purple band | Red with "METAL" text | D only |
Choosing the Right Extinguisher for Your Location
Home (General Living Areas, Bedrooms, Hallway)
- Best choice: 2 kg or 4 kg ABC dry powder extinguisher.
- Why: Covers all common home fire risks (furniture, curtains, electrical, small liquid fires).
- Location: Near the main exit (not hidden in a cupboard).
- Price range: ?600–1,200.
Home Kitchen
- Best choice: Fire blanket (1m × 1m) + 1 kg ABC dry powder (for non-oil fires).
- Alternative: 2 litre water mist extinguisher (safe on oil fires if rated).
- Not recommended: ABC dry powder on oil fires — creates a mess and may not fully extinguish.
- Price range: Fire blanket ?350–900, ABC 1 kg ?400–700.
Office / Shop / Retail
- Best choice: 4 kg or 6 kg ABC dry powder extinguishers at each fire point.
- For server/electrical rooms (additional): 4.5 kg CO? extinguisher (no residue).
- Quantity: Minimum 1 per 200 sq. metres, with travel distance to extinguisher <15 metres.
- Price range: ABC 4 kg ?900–1,500, CO? 4.5 kg ?2,000–3,500.
Commercial Kitchen (Restaurant/Hotel)
- Mandatory (NBCS 2026): Fixed automatic wet chemical suppression system over all cooking appliances (Ansul R-102 or equivalent).
- Backup portable: 6 litre or 9 litre wet chemical (Class F) extinguisher at kitchen exit.
- Additional: Fire blanket near fryers.
- Price range: Wet chemical 6 litre ?3,500–7,000, fixed system ?80,000–3,00,000+.
Petrol Station / Paint Shop / Flammable Liquid Storage
- Best choice: 9 kg ABC dry powder extinguisher (minimum) — higher rating for Class B.
- Additional: 22.5 kg or 50 kg ABC trolley-mounted extinguisher for larger hazards.
- Also: Foam (AFFF) extinguishers for liquid spill fires.
- NOT suitable: CO? alone (insufficient Class B rating for large spill fires).
Data Centre / Server Room
- Best choice: Clean agent (Novec 1230, FM-200) fixed system or portable.
- Portable backup: CO? (4.5 kg or 6.5 kg) — zero residue, non-conductive.
- Not recommended: ABC dry powder — residue is corrosive and conductive, will destroy servers.
Vehicle (Car / Truck / Bus)
- Best choice: 1 kg or 2 kg ABC dry powder.
- Mounting: In cabin, accessible to driver, secured to prevent rolling.
- Check pressure regularly: Vehicle vibration and temperature extremes cause pressure loss faster than stationary extinguishers.
- Price range: ?500–1,000.
Fire Extinguisher Sizing — Minimum Recommendations by Area
| Building Type | Minimum extinguisher rating per fire point | Maximum travel distance to extinguisher |
|---|---|---|
| Residential (home) | 2A:10B:C (2 kg ABC) | 15 metres |
| Office / commercial | 4A:34B:C (4 kg ABC) | 15 metres |
| Industrial (general) | 6A:55B:C (6 kg ABC) | 12 metres (higher risk) |
| Warehouse | 9A:89B:C (9 kg ABC) or larger trolley | 12 metres |
| Commercial kitchen | 6 litre wet chemical (Class F) + fixed system | 10 metres to portable backup |
| Petrol station | 9A:89B:C (9 kg ABC) minimum | 10 metres |
| Vehicle | 1A:10B:C (1 kg ABC) | Within cabin reach |
| Laboratory (chemical) | 4A:34B:C (ABC) + Class D if metal hazards | 10 metres |
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