When working in any aircraft hangar project, the first step is to determine the hangar classification. NFPA 409 classifies hangars as groups: Group I, II, III, or IV. This presentation defines each of these. This is an excerpt from my training resource, "NFPA 409 - Resource Guide". You can find out more at, http://bit.ly/1OJylg0 .

1. Guide to Hangar
Classifications
Provided by:
www.TheCodeCoach.com
*as defined in NFPA 409, Standard on Aircraft Hangars

2. Group
I - II - III - IV
Hangars are classified by groups:
Groups I through III are classified by fire area and door height.

3. 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…”

4. Fire Area
1Hr.FireRated
Fire Area 1 Fire Area 2

5. Group I Hangar
> 40,000 sq. ft.
-or-
> 28’
door height greater
than 28’
single fire area greater than 40,000 sq. ft.

6. Group I Hangar
-or-
ability to house aircraft with a tail height of over 28’

7. 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

8. Group II Hangar

9. 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

10. Group III Hangar

11. Group IV Hangar
membrane covered, rigid steel frame
structures

12. 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.