2022 NFPA 409 Standard - Current Edition
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NFPA 409 Handbook
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  • Description

    Keep pace with rapidly changing aircraft hangar safety requirements by referencing the significantly updated NFPA 409, 2022 edition.

    There are safety considerations and hazards unique to aircraft hangars that must be accounted for to help protect lives and property. NFPA 409, Standard on Aircraft Hangars, provides the specifications and requirements for the construction and fire protection of buildings or structures intended to house aircraft.

    The standard covers all sizes and varieties of aircraft hangars utilized for storage, maintenance, and other applications.

    Content covers:

    • Referenced publications and general and NFPA definitions
    • Aircraft hangar group classifications
    • Group I and II aircraft hangar construction
    • Group I and II aircraft hangar protection
    • Group III and IV aircraft hangars
    • Paint hangar construction and fire protection
    • Inspection, testing, and maintenance
    • Special provisions for unfueled aircraft hangars

    The 2022 edition features extensive revisions to reflect cutting-edge engineering principles, the most current test data, and collected field experience.

    NFPA 409, Standard on Aircraft Hangars, is a vital resource for everyone from architects, designers, and engineers to contractors, installers, and facility and construction managers. The 2022 standard includes a variety of notable changes that may be relevant to your work and industry.

    Edits to this edition include:

    • New provisions and updates to existing sections of NFPA 409
    • Added sections in Chapter 1 on application and retroactivity to allow for their use within the standard
    • Several new definitions in Chapter 3 to provide further context for the technical changes made during this revision cycle
    • Introduction of Chapter 4, "Fire Protection Approaches", to allow for an evaluation of the fire risks and hazards for an aircraft hangar as found on a specific site
    • New Chapter 5, "Performance-Based Design Approach", to complement Chapter 4, permitting the use of a performance-based design for aircraft hangars based on specified criteria and a final approval performed by the authority having jurisdiction
    • Added section in Chapter 6 on ignitable liquid drainage floor assemblies to permit the use of this protection method within specified hangars
    • Revised Chapter 11 outline and new inspection, testing, and maintenance requirements that have applicability across several NFPA® documents
    • Changes to other existing requirements, as well as updates pertaining to general organization and reference publications

    Access the criteria and guidance for better protecting aircraft hangars from the source you trust at NFPA.

    Help to ensure you or your team are working with the most relevant and reliable information. Place your order today for NFPA 409, Standard on Aircraft Hangars, 2022 edition. (Print, 50 pp., 2022)

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    NFPA codes and standards both provide requirements for achieving outcomes. Handbooks take a deeper dive, providing the full text of a code or standard as well as expert commentary and features such as graphics, decision trees, testing procedures, case studies, sample forms and checklists, and other helpful aids to give a better understanding of the reasoning behind the requirements and how to apply them.


    • A code or standard is a framework—a set of rules to follow with a goal to achieve a certain result
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    The simplest way to think about it is that codes and standards list the technical requirements while handbooks explain those requirements to clarify how to apply them.

  • Table of Contents (2022 Current Edition)

    NFPA® 409, Standard on Aircraft Hangars, 2022 Edition

    Chapter 1 Administration
    1.1 Scope.
    1.2 Purpose.
    1.3 Application.
    1.4 Retroactivity.
    1.5 Equivalency.
    1.6 New Technology.
    1.7 Units.
    Chapter 2 Referenced Publications
    2.1 General.
    2.2 NFPA Publications.
    2.3 Other Publications.
    2.4 References for Extracts in Mandatory Sections.
    Chapter 3 Definitions
    3.1 General.
    3.2 NFPA Official Definitions.
    3.3 General Definitions.
    Chapter 4 Fire Protection Approaches
    4.1 Fire Protection Approach.
    4.2 Fire Risk Assessment.
    Chapter 5 Performance-Based Design Approach
    5.1 Performance-Based Design Approach.
    5.2 Goals and Objectives.
    5.3 Qualifications.
    5.4 Independent Review.
    5.5 Final Determination.
    5.6 Maintenance of Performance-Based Design Approach.
    5.7 Performance Criteria.
    Chapter 6 Aircraft Hangar Groups
    6.1 Aircraft Hangar Classification.
    Chapter 7 Construction of Group I and Group II Aircraft Hangars
    7.1 Defueled Aircraft.
    7.2 Types of Construction.
    7.3 Internal Separations.
    7.4 Clear Space Distance Requirements Around Hangars.
    7.5 Floors.
    7.6 Roofs.
    7.7 Primary Structural Steel Columns Supporting the Roof.
    7.8 Doors.
    7.9 Curtains.
    7.10 Landing Gear Pits, Ducts, and Tunnels.
    7.11 Exposed Interior Insulation.
    7.12 Drainage of Aprons and Hangar Floors.
    7.13 Heating and Ventilating.
    7.14 Lighting and Electrical Systems.
    7.15 Lightning Protection.
    7.16 Grounding Facilities for Static Electricity.
    7.17 Exit and Access Requirements.
    7.18 Draft Curtains.
    Chapter 8 Protection of Group I Aircraft Hangars
    8.1 General.
    8.2 Fire Protection Systems.
    8.3 Wheeled and Portable Extinguishers.
    8.4 Protection System Alarms.
    Chapter 9 Protection of Group II Aircraft Hangars
    9.1 General.
    9.2 Closed-Head Water Sprinkler System for Aircraft Storage and Servicing Areas.
    9.3 Foam Concentrate — General.
    9.4 Low-Expansion Foam System.
    9.5 High-Expansion Foam System.
    9.6 Closed-Head Foam-Water Sprinkler System.
    9.7 Detection and Actuation Systems.
    9.8 Water Supply.
    Chapter 10 Group III Aircraft Hangars
    10.1 Construction.
    10.2 Separation and Internal Subdivisions.
    10.3 Heating and Ventilating.
    10.4 Lighting and Electrical Systems.
    10.5 Lightning Protection.
    10.6 Grounding Facilities for Static Electricity.
    10.7 Exit and Access Requirements.
    10.8 Fire Protection for Group III Hangars.
    Chapter 11 Group IV Aircraft Hangars
    11.1 Construction.
    11.2 Internal Separations.
    11.3 Clear Space Distance Around Hangars.
    11.4 Aprons and Floors.
    11.5 Doors.
    11.6 Curtains.
    11.7 Landing Gear Pits, Ducts, and Tunnels.
    11.8 Exposed Interior Insulation.
    11.9 Drainage of Aprons and Hangar Floors.
    11.10 Heating and Ventilating.
    11.11 Lighting and Electrical Systems.
    11.12 Grounding Facilities for Static Electricity.
    11.13 Exit and Access Requirements.
    11.14 Fire Protection for Membrane-Covered Rigid-Steel-Frame-Structure Hangars.
    Chapter 12 Paint Hangars
    12.1 Construction.
    12.2 Fire Protection.
    12.3 Ventilation.
    12.4 Electrical Equipment.
    12.5 Operations.
    Chapter 13 Inspection, Testing, and Maintenance
    13.1 Fire Protection Systems.
    Chapter 14 Defueled Aircraft Hangars
    14.1 General.
    14.2 Construction.
    14.3 Lighting and Electrical Systems.
    14.4 Grounding Facilities for Static Electricity.
    14.5 Protection of Defueled Aircraft Hangars.
    14.6 Spray Application of Flammable and Combustible Liquids.
    14.7 Portable Extinguishers.
    14.8 Protection System Alarms.
    Annex A Explanatory Material
    Annex B Building Construction Types
    Annex C Type Qualification for Aircraft Hangar Radiant Energy–Sensing Fire Detectors and Controls
    Annex D Informational References
  • 2016 Edition

    2016 Edition

    Major changes in the 2016 edition of NFPA 409 impact the design of fire protection systems in new Group I and Group II aircraft hangars.

    Revised based on sound engineering principles, the latest test data, and recent field experience, NFPA 409, Standard on Aircraft Hangars provides specifications for construction and fire protection of all types of aircraft hangars.

    Engineers, designers, architects, contractors, installers, facility and construction managers, insurance professionals, and others responsible for the safety of people, facilities, and equipment, need to know how revisions in the new NFPA 409 impact their work.

    Significant changes make the Standard easier and more cost-effective to apply in certain scenarios:

    • Low-level foam systems in Group I hangars can now be divided into zones that are independently activated, based on activation of an associated sprinkler zone or automatic detection zone.
    • Revised requirement for a minimum of two fire pumps specifies that a redundant pump will not be required for systems that use two or more pumps to meet the minimum demand.
    • Reserve supply of foam concentrate now permitted to meet the requirements of the 2016 edition NFPA 11, Standard for Low-, Medium-, and High-Expansion Foam, which does not require a connected reserve.
    • The requirement for water reservoirs to be divided into equal parts has been relaxed to a recommendation.
    • The chapter on Group III hangars has been simplified by eliminating the concepts of row hangars and hangar building clusters.
    • Minimum separation between aircraft storage and servicing areas in Group I and Group II hangars has been relaxed from a 3-hour fire wall to a 2-hour fire barrier wall.

    Editorial changes and updated references to other codes and standards make the 2016 NFPA 409 an industry essential. (Print, 39 pp., 2016)

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  • Also in NFPA 409: Standard on Aircraft Hangars