Guide to Hangar Classifications

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*as defined in NFPA 409, Standard on Aircraft Hangars

Group I - II - III - IV

Hangars are classified by groups:

Groups I through III are classified by fire area and door height.

Fire Area

“...an area of a building separated from the

remainder of the building by construction

having a fire resistance of at least 1 hour…”

Fire Area

1 H

r. F

ire

Rat

ed

Fire Area 1 Fire Area 2

Group I Hangar

> 40,000 sq. ft.-or-

> 28’

door height greater

than 28’

single fire area greater than 40,000 sq. ft.

Group I Hangar-or-

ability to house aircraft with a tail height of over 28’

Group II Hangar

< 28’

< 40,000 sq. ft.

-and-

-per- Table 4.1.2

door height of 28’ or

less

single fire area as outlined in NFPA 409, Table 4.1.2, based on construction type

Group II Hangar

Hangar Classification - Group III

< 28’ -and-

< 30,000 sq. ft.

-per- Table 4.1.3

door height of 28’ or

less

single fire area as outlined in NFPA 409, Table 4.1.3, based on construction type

Group III Hangar

Group IV Hangar

membrane covered, rigid steel frame

structures

What do you need to know about aircraft hangars?

● understand and identify the protection, construction, and

maintenance requirements for aircraft hangars

● practically apply the requirements of NFPA 409

● implement a plan of action to ensure compliance with the

standard

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This guide includes all checklists, tools, resources, and training guides required for NFPA 409 compliance.