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Guide to Hangar Classifications
Provided by:
www.TheCodeCoach.com
*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.