Can an Exit Enclosure Be Class I Division 1?

6/30/2020

We have an exit enclosure that is rated as Class I Division I. My understanding of an accessible route and means of egress, is that it is a "safe" means of egress.

Can an accessible route have a Class I Division I (explosion hazardous classification), or does it need to be purged and pressurized according to Type X requirements?

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3 Comments

Thomas Reinhardt

6/30/2020 02:38:30 pm

I believe if the egress area is a Group H area then no you cannot use it as an egress.

Justin Milne

7/1/2020 03:23:02 pm

I’m agree. To further reiterate, I think NFPA 101 classified this as a high-challenge fire scenario, a flammable gas in the means of egress, therefore requiring a high challenge fire wall in accordance with NFPA 221 per NFPA 101 Section 8.3.1.3.

Brian Gerdwagen

7/6/2020 02:26:44 pm

I guess the question is "Is it required to have an exit enclosure as Class I Div 1?" No. There is also not a requirement to pressurize the enclosure under normal circumstances.

As others have said, if the area has flammable vapors that would require Electrical Classification, it's not an Exit Enclosure and you can't use it as one.

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