Jon,

I don't know the answer to that and leave it to others who are ventilation and lab safety experts and can judge based upon the chemical and physical properties of iron carbonyl and the use of laboratory hoods.

As far as your quote, there may be possibly a number of degrees of rightness and wrongness on the spectrum of right and wrong. Please note that on the monochrome black and white spectrum, although there maybe 136 shades of gray on the Hex, RBG & CMYK codes, the human eye can only differentiate 30 shades.

All My Best,

John

On Aug 3, 2022, at 16:33, Jonathan Klane <jklane1**At_Symbol_Here**asu.edu> wrote:

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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