NFPA 10 — Standard for Portable Fire Extinguishers

NFPA 10 Scope - Key Specifications and Tables

• Scope: NFPA 10 covers selection, installation, inspection, maintenance, and testing of portable fire extinguishers.

• Extinguishing Agents & Capacities (Table H.2 Summary):

• General Notes:
  • Protection below 40°F (4°C) generally not required.
  • Use UL or ULC classifications to match extinguisher rating with hazard type.
  • SI conversions per Clause 1.3.2: multiply by factor then round.

Quick Selection Flowchart for Portable Extinguishers

flowchart TD
  A[Identify Fire Class] --> B{Class A, B, C, K?}
  B -->|A| C[Select Water or Foam Extinguisher]
  B -->|B| D[Select Dry Chemical or Halon Extinguisher]
  B -->|

NFPA 10 Referenced Publications Overview

• Purpose: Referenced publications in NFPA 10 are standards and documents incorporated by reference to ensure compliance and consistency.
• Key Point: These documents form an integral part of NFPA 10 requirements.
• Conversion to SI Units:
  Use the formula:
  [ \text{SI value} = \text{Imperial value} \times \text{Conversion factor} ]
  Then round to the correct significant digits as per Clause 1.3.2.

Common Conversion Factors (Example)

Summary Flowchart of Referenced Publications Usage

flowchart TD
  A[Start] --> B[Identify Referenced Publication]
  B --> C{Is document part of NFPA 10?}
  C -->|Yes| D[Apply requirements from document]
  C -->|No| E[Do not apply]
  D --> F[Use conversion factors if needed]
  F --> G[Complete compliance check]
  E --> G

Note: For detailed referenced standards, consult NFPA 10 Chapter 2 directly.

NFPA 10: Key Definitions and Units

• Definitions: NFPA 10 uses standard terms defined in its chapters; if undefined, Merriam-Webster's Collegiate Dictionary (11th ed.) meanings apply.

• Units and Conversions (Table 1.3.1.1):

• Usage: Use these units consistently for measurements related to fire extinguisher specifications and performance.

flowchart TD
    A[Start: Need Definition] --> B{Defined in NFPA 10?}
    B -->|Yes| C[Use NFPA 10 Definition]
    B -->|No| D[Use Merriam-Webster Meaning]
    C --> E[Apply Relevant Units]
    D --> E
    E --> F{Need Unit Conversion?}
    F -->|Yes| G[Use Table 1.3.1.1]
    F -->|No| H[Proceed with Data]

NFPA 10 General Requirements - Key Formulas, Tables, and Specifications

1. General Requirements (Chapter 4)

• Listing and Labeling: Extinguishers must be listed by a recognized testing laboratory and labeled for intended use (4.1).
• Identification of Contents: Clear labeling of extinguishing agent (4.2).
• Instruction Manual: Must accompany each extinguisher (4.3).
• Electrical Conductivity: Requirements for CO2 hose assemblies (4.1.4).
• Obsolete Extinguishers: Guidelines for condemning and marking (4.4).

2. Installation (Chapter 6)

• Number of Extinguishers: Based on hazard class and area (6.1.1).
• Placement:
  • Maximum travel distance to extinguisher: 75 ft for Class A, 50 ft for Class B hazards (6.1.3).
  • Installation height: Extinguisher top not more than 5 ft above floor; if over 40 lbs, max height 3.5 ft (6.1.3.9).
• Visibility: Must be readily visible or marked with signage (6.1.3.3, 6.1.3.10).
• Cabinets: Specifications for locked and unlocked cabinets (6.1.3.11).

3. Maintenance (Chapter 7)

• Inspection Frequency: Monthly visual inspections and annual maintenance (7.2, 7.3).
• Hydrostatic Testing: Performed every 5 or 12 years depending on extinguisher type (Chapter 8).
• Pressure Gauges: Must be checked and maintained (7.9).
• Corrective Actions: Required if extinguisher fails inspection or testing (7.3.5, 7.6.3).

4. Key Tables (Examples)

NFPA 10: Classification and Selection of Fire Extinguishers

NFPA 10 classifies fire extinguishers based on fire types and provides selection criteria:

1. Fire Extinguisher Classes:

• Class A: Ordinary combustibles (wood, paper)
• Class B: Flammable liquids (oil, gasoline)
• Class C: Energized electrical equipment
• Class D: Combustible metals (magnesium)
• Class K: Cooking oils and fats (kitchen fires)

2. Extinguisher Ratings:

3. Selection Criteria:

• Match extinguisher class to fire hazard.
• Minimum rating depends on occupancy and hazard level.
• For Class A: Minimum 2A rating for ordinary hazard.
• For Class B: Ratings depend on square feet of flammable liquid area.
• Class C extinguishers are rated by their non-conductivity; often combined with A or B.

4. Key Formula for Class B Rating:

[ \text{Minimum Rating} = \text{Area of flammable liquid} \times \text{Extinguisher coverage factor} ]

5. Placement:

• Maximum travel distance to extinguisher varies by hazard:
  • Class A: 75 ft max
  • Class B (low hazard): 50 ft max
  • Class B (high hazard): 30 ft max

flowchart TD
A[Identify Fire Hazard] --> B{Fire Class}
B -->|Class A| C[Select Extinguisher with 2A+ rating]
B -->|Class B| D[Select Extinguisher by sq.ft. rating]
B -->|Class C| E[Use non-conductive extinguisher]
B -->|Class D| F[Use metal-specific extinguisher]
B -->|Class K| G[Use kitchen fire extinguisher]

C --> H[Place within

NFPA 10 Installation Requirements - Key Points

Installation Height (6.1.3.9)

• Portable fire extinguishers must be installed so the carrying handle is 3.5 to 5 feet above the floor.
• For extinguishers weighing over 40 lbs, the handle height max is 3.5 feet.
• Extinguishers must be mounted securely to prevent falling.

Number and Placement (6.1.1, 6.1.3)

• Number of extinguishers depends on hazard class and floor area.
• Extinguishers must be visible and unobstructed.
• Maximum travel distance to extinguisher:
  • Class A hazards: 75 ft
  • Class B hazards: 50 ft
• Cabinets (6.1.3.11) must allow quick access; locked cabinets only if authorized.

Special Installations (6.2 to 6.7)

• Class A: Water or multipurpose extinguishers.
• Class B: Foam, CO2, dry chemical; consider flammable liquid depth.
• Class C: Non-conductive agents.
• Class D: Special dry powders.
• Class K: Wet chemical for cooking appliances.

Maintenance & Signage (7.11, 7.13)

• Maintain clear signage and accessibility.
• Service collars exempt certain extinguishers from monthly checks.
• Pressure gauges and weight scales must be checked regularly.

Summary Table: Max Mounting Heights

flowchart TD
  A[Determine Hazard Class] --> B{Class A?}
  B -->|Yes| C[Install Extinguishers every 75 ft travel]
  B -->|No| D{Class B?}
  D -->|Yes| E[Install Extinguishers every 50 ft travel]
  D -->|No| F[Use Special Extinguishers (C, D, K)]
  C --> G[Mount 3.5-5 ft height]
  E --> G
  F --> G
  G --> H[Ensure Visibility and Accessibility]
  H --> I[Maintain Signage and Service]

**Note

NFPA 10: Inspection, Maintenance, and Testing Key Points

1. Inspection (Clause 7.2 & 7.3.2)

• Monthly visual inspection: Check physical condition, pressure gauge, seals, and tamper indicators.
• Annual external examination: Inspect boots, foot rings, attachments, and overall condition.
• Corrective action if defects found (Clause 7.3.2.5).

2. Maintenance (Clause 7.3)

• Follow specific maintenance intervals:
  • Annual maintenance for all extinguishers.
  • Six-year internal examination for certain types (Clause 7.3.6).
• Maintenance includes checking expellant gas, agent condition, and mechanical parts.
• Use manufacturer procedures or NFPA guidelines.

3. Testing (Chapter 8)

• Hydrostatic testing intervals vary by extinguisher type (stored-pressure, cartridge-operated).
• Typical hydrostatic test pressures:

  Extinguisher Type	Test Pressure (psi)
  Stored-Pressure	300 - 600
  Cartridge-Operated	400 - 600
  Hose Assemblies	300 - 500

• Record all test results and maintain documentation.

4. Recharging (Clause 7.8)

• Recharge after any use or when pressure gauge indicates low pressure.
• Use correct recharge agents per extinguisher type (dry chemical, CO2, halogenated agents, etc.).
• Follow recharge frequency and procedures strictly.

Summary Flowchart: Inspection to Recharge Process

flowchart TD
  A[Monthly Inspection] -->|Pass| B[Annual Maintenance]
  A -->|Fail| C[Corrective Action]
  B --> D[Hydrostatic Testing?]
  D -->|Yes| E[Perform Hydrostatic Test]
  D -->|No| F[Check Recharge Need]
  E --> F
  F -->|Recharge Needed| G[Recharge Extinguisher]
  F -->|No Recharge| H[Record & Return to Service]
  C --> H
  G --> H

References:

• NFPA 10, Chapter 7 (Inspection, Maintenance, Recharging)
• NFPA 10, Chapter 8 (

NFPA 10: Hydrostatic Testing and Recharging Key Points

• Hydrostatic Testing:

  • All air must be vented before testing to avoid dangerous cylinder failure (8.1.4.2).
  • Aluminum cylinders exposed to >350°F (177℃) must be hydrostatically tested (8.1.5).
  • Hydrostatic test pressure typically is 5/3 times the service pressure or as specified by manufacturer.

• Recharging:

  • Only use manufacturer-approved extinguishing agents.
  • Recharging must restore extinguisher to full operational pressure and weight.
  • Follow inspection and maintenance per Clause 7 (no specific formula but periodic checks).

• Test Equipment:

  • Must be calibrated and capable of applying required test pressures safely (8.2).

Typical Hydrostatic Test Pressure Formula:

[ P_{test} = \frac{5}{3} \times P_{service} ]

Where:

• (P_{test}) = Hydrostatic test pressure
• (P_{service}) = Normal operating pressure of the extinguisher

Simplified Flowchart for Hydrostatic Testing Process:

flowchart TD
  A[Start Testing] --> B[Vent All Air]
  B --> C{Cylinder Material}
  C -->|Aluminum| D[Check Exposure >350°F]
  C -->|Other| E[Proceed to Test]
  D -->|Yes| E
  D -->|No| F[No Test Required]
  E --> G[Apply Hydrostatic Pressure]
  G --> H{Pass Test?}
  H -->|Yes| I[Record Test & Recharge]
  H -->|No| J[Remove from Service]

Summary: Vent air before testing, test aluminum cylinders exposed to high heat, use 5/3 service pressure for hydrostatic tests, and recharge only with approved agents.

NFPA 10: Marking and Labeling Key Points

1. Hydrostatic Test Label (Clause 8.7.2 & Fig. A.8.7.2)

   • Label background: Silver
   • Print color: Black
   • Contents include:
     • Test month/year grid (JAN to DEC, years)
     • "HYDROSTATIC TEST PERFORMED BY" with distributor name, phone, license no.
     • Test pressure (PSI)
     • Employee name who performed the test

2. Labeling Requirements (Clause 7.8.4.8.1)

   • Extinguishers must have durable, legible labels indicating:
     • Type of extinguisher
     • Class of fire it is suitable for
     • Operating instructions

3. Recommended Markings by Fire Class (Annex B)

   • Labels should clearly indicate suitability for:
     • Class A (ordinary combustibles)
     • Class B (flammable liquids)
     • Class C (electrical fires)
     • Class D (combustible metals)
     • Class K (cooking oils/fats)

Summary Table: Hydrostatic Test Label Contents

flowchart TD
  A[Start] --> B{Is extinguisher tested?}
  B -->|Yes| C[Apply Hydrostatic Test Label]
  B -->|No| D[Check Expiry Date Label]
  C --> E{Label Contents}
  E --> F[Test Date]
  E --> G[Distributor Info]
  E --> H[Test Pressure]
  E --> I[Employee Name]
  D --> J{Is extinguisher suitable?}
  J -->|Yes| K[Apply Class Suitability Label]
  J -->|No| L[Remove or service extinguisher]

Note: Always follow NFPA 10 for label durability, legibility, and placement.

NFPA 10: Training and Certification Key Points

• Certification Requirements (7.1.2.1.2):
  Must pass a test by an organization acceptable to the Authority Having Jurisdiction (AHJ).

• Permitted Activities for Trainees (7.1.2.1.1):
  Trainees can perform maintenance and recharging only under direct supervision of a certified person.

• Criteria for Persons Performing Maintenance (7.1.2.1 A):

  1. Factory training and certification for specific extinguisher type/brand.
  2. Certification by an AHJ-accepted organization.
  3. Registration/licensure/certification by local or state AHJ.

• Certification Definition:
  A documented confirmation of passing a test based on NFPA 10 chapters and annexes, accepted by the AHJ.

Summary Table: Certification Pathways

Flowchart: Certification Process Overview

flowchart TD
  A[Start Training] --> B{Under Supervision?}
  B -->|Yes| C[Perform Maintenance & Recharge]
  B -->|No| D[No Maintenance Allowed]
  C --> E{Pass Certification Test?}
  E -->|Yes| F[Certified Technician]
  E -->|No| G[Repeat Training & Test]

Additional Notes:

• Certification documents must be acceptable to the AHJ.
• Some AHJs may have their own licensing/testing programs.
• Training includes knowledge of maintenance, recharging, inspection, and safety per NFPA 10.

This ensures qualified personnel safely maintain fire extinguishers, complying with NFPA 10 standards.

NFPA 10 Explanatory Material Key Points

The NFPA 10 explanatory material supplements the standard with definitions, selection criteria, maintenance, and distribution guidelines for portable fire extinguishers. It references related UL standards and provides detailed annexes for practical application.

Key References & Sections:

• Annex A: Explanatory Material with definitions and clarifications.
• Annex C: Fire extinguisher selection principles and matching extinguishers to hazards.
• Annex E: Distribution and placement of extinguishers by fire class (A, B, C, D, K).
• Annex G: Classification and rating system of extinguishers.
• Annex H: Conditions affecting extinguisher selection (health, safety, physical).
• Chapter 7: Inspection, maintenance, and recharging procedures.
• Chapter 8: Hydrostatic testing requirements.

Important Formulas & Tables (from NFPA 10 and referenced UL standards):

Sample Table: Maximum Travel Distance to Extinguisher (Class A)

Selection Flowchart for Fire Extinguishers

flowchart TD
  A[Identify Fire Hazard Class] --> B{Class A, B, C, D, K?}
  B -->|A| C[Select Water or Foam Extinguisher]
  B -->|B| D[Select Dry Chemical or CO2 Extinguisher]
  B -->|C| E[Select Non-Conductive Extinguisher]
  B -->|D| F

NFPA 10: Recommended Marking System for Fire Extinguishers

Key Specifications:

• Legibility Distance: Markings near extinguishers must be easily readable from 15 ft (4.6 m).
• Durability: Use decals resistant to fading for markings.

Color Coding for Markings (Clause 1.1 B.1.1):

Hydrostatic Test Label Design (Clause 8.7.2):

• Print: Black on silver background.
• Includes:
  • Test month/year grid
  • Distributor name, phone, license number
  • Test pressure (PSI)
  • Employee performing test
• Refer to Figure A.8.7.2 for layout.

Summary Flowchart of Marking System:

flowchart TD
  A[Start Marking Process] --> B{Apply Markings Near Extinguisher?}
  B -->|Yes| C[Use Durable Decals]
  C --> D{Select Colors}
  D --> E[Picture Symbols: White]
  D --> F[Background Borders: White]
  D --> G[YES Background: Blue]
  D --> H[NO Background: Black]
  D --> I[Letters: Black]
  D --> J[Slash Mark on NO: Red]
  B -->|No| K[No Marking Required]
  E & F & G & H & I & J --> L[Ensure Legibility at 15 ft]
  L --> M[Complete Marking]

This system ensures clear, standardized identification of extinguisher suitability and testing status per NFPA 10.

NFPA 10: Fire Extinguisher Types and Components - Key Points

Fire Extinguisher Types (Clause D.4)

Selection Range (Clause 10.7)

• Effective discharge range: 6 to 35 ft (1.8 to 10.7 m)
• Ratings from 1-B:C to 10-A:120-B:C indicating fire size and class coverage

Important Notes

• Some small ammonium phosphate dry chemical extinguishers may lack Class A rating.
• Halon use is restricted to situations requiring its unique properties due to environmental concerns.

Maintenance (Annex I)

• Table I.1 (a): Mechanical Parts Checklist (valves, hoses, containers)
• Table I.1 (b): Agent-specific maintenance (dry chemical, CO2, powder)

Summary Table: Fire Extinguisher Components

flowchart TD
    A[Fire Extinguisher Types] --> B1[Carbon Dioxide]
    A --> B2

NFPA 10: Operation and Use - Key Points

Operation (Annex D)

• Basic Steps to Operate Extinguishers (D.2.4):

  1. Pull the pin to unlock the operating lever.
  2. Aim the nozzle at the base of the fire.
  3. Squeeze the lever slowly to discharge.
  4. Sweep the nozzle side to side.

• Expellant Gas/Pressure (D.2.5):
  Extinguishers use stored pressure or cartridge systems to expel agent.

Maintenance (Clauses 7.7 - 7.14)

• Pressure Gauges (7.9): Check monthly for proper pressure.
• Maintenance Collar (7.13): Used for recharge and maintenance; exemptions apply.
• Weight Scales (7.14): Used to verify agent quantity.
• Corrective Action (7.7.3): Required if defects found during inspection.
• Hoses and Regulators (7.7): Inspect for damage and leaks.

Installation & Placement (Chapter 6)

• Height: Typically 3.5 to 5 ft from floor to handle (6.1.3.9).
• Visibility: Labels must be visible and unobstructed (6.1.3.10).
• Number & Location: Based on hazard class and travel distance (6.1.1, 6.2-6.7).

Extinguisher Performance Table (Annex H excerpt)

Key NFPA 10 Guidelines for Selection of Residential Fire-Extinguishing Equipment

1. Types and Maintenance Intervals (Table F.7.3.2)

• *Nonrechargeable dry chemical: no internal inspection; remove after 12 years.
• +Nonrechargeable halogenated agent: no internal inspection; remove after 12 years; return for reclaiming.

2. Selection Principles

• Use extinguishers near escape routes.
• Stay low to avoid smoke and fumes.
• Use appropriate extinguisher type for fire class (A, B, C, D, K).
• If fire not controlled quickly, evacuate and call fire department.

3. Fire Class and Extinguisher Types

4. Recommended Placement & Usage

• Minimum placement distances per NFPA 10 (F.6.1).
• Rechargeable extinguishers must be recharged after use (F.6.4).
• Follow safety precautions (F.6.3).

5. Maintenance & Inspection

• Regular inspections (F.7.2).
• Maintenance per intervals (F.7.3).
• Hydrostatic testing per extinguisher type (Table F.7.3.2).

flowchart TD
  A[Fire Starts in Residence] --> B{Is Fire Small and Controllable?}
  B -->|Yes| C[Use