NFPA 409:2022

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

This standard contains the minimum requirements for the proper construction of aircraft hangars and protection of aircraft hangars from fi€re.