I think that Debbie's question was about the meaning or definition intended by "explosion-proof hood".

Does it mean rated as class 1 division 1 as she suggests?

Or is it a less formal meaning that the hood structure won't give way, or will blow out vertically, or another similar meaning that isn't class 1, div 1.

Of course, I could be wrong. As I like to remind myself and others, "I've been wrong before, I'll be wrong again. I just happen to think I'm right this time." ;-)

I hope this helps.

All my best,

Jon

Jonathan Klane, M.S.Ed., CIH, CSP, CHMM, CIT

Senior Safety Editor, Lab Manager Magazine

PhD candidate, Human + Social Dimensions of Science + Technology

College of Global Futures

School for the Future of Innovation in Society

On Wed, Aug 3, 2022 at 2:11 PM John Callen <jbcallen**At_Symbol_Here**gmail.com> wrote:

Debbie,

My comment was based from the reactivity of iron pentacarbonyl as a flammable liquid, etc.

Please look at the warnings, especially "Prevention" in the attached link.

https://www.ilo.org/dyn/icsc/showcard.display?p_lang=en&p_card_id=0168&p_version=2

When I was in graduate research, I always took a very cautious and measured approach when I was working with or around others who were working with boranes, carbonyls and other pyrophorics, explosive & shock sensitive, etc. chemicals. That why I stated the use of an explosion-proof laboratory hood.

All My Best,

John

On Aug 3, 2022, at 15:01, Debbie Decker <debbie.m.decker**At_Symbol_Here**gmail.com> wrote:

John Callen writes "...the meantime, Iron pentacarbonyl, as you know, is nasty stuff and should be used with extreme caution in an explosion-proof laboratory hood."

I'm wondering what you meant by the phrase "explosion-proof laboratory hood." This brings to mind for me Class 1, Division 1 electrical utilities to the hood, installed in a space with a similarly protected electrical system.

Is that your intent?

Debbie

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