Roy's post on must and shall should clear this up, however, you also said:

As much I enjoy Youtube for catching up on stupid cat videos, SNL skits and the like, I really hate it at work....

For me, reviewing SNL skits is work.   I just reviewed last weeks SNL duel sketch with Sandra Oh and it appears three squibs (bullet hits) with blood bags were used, which almost surely means she was exposed to lead fume by inhalation and skin contact.  Those are usually one grain hits (lead styphnate) which can release a 28.6 mg of lead per hit x 3 = 85.8 mg of lead in a respirable form released at her upper arms and upper abdomen.  Considering that the OSHA PEL is 0.05 mg/m3, that's a lot of lead in the area near the breathing zone.

Monona Rossol

-----Original Message-----
From: Margaret Rakas <mrakas**At_Symbol_Here**SMITH.EDU>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Wed, Apr 10, 2019 4:15 pm
Subject: [DCHAS-L] Interpreting NFPA 45 Section 12.3.2.1.2

Folks--I would appreciate your help with making sure I interpret this section of NFPA 45 (2019) correctly-

12.3.2.1.2-"Experiments or demonstrations that involve or produce hazardous quantities of fumes, vapors, particulates or gases SHALL (my emphasis) be performed in a chemical fume hood or other ventilation device, including demonstration hoods or other devices that meet the requirements of 2.1.1 of  ANSI/AIHA Z9.5..that is, able to capture the materials being evolved."

In the next section (12.3.2.1.3), experiments performed outside of a fume hood are discussed in terms of using a protective shield or keeping viewers at least 10 feet away.

My reading is that because SHALL is used in 12.3.2.1.2, ALL experiments involving hazardous quantities of fumes, etc. MUST occur in a fume hood or other containment device.  (Section 12.3.2.1.3 is referring to demonstrations that DON'T involve hazardous quantities of fumes, etc).

1) Am I correct in my reading?

2) Would moving a 6 ft Rubens Tube, which requires flammable gas in order to produce the demonstration, to an outdoor setting with viewers 10 feet away meet the spirit of 12.3.2.1.2?  Or would NFPA 160 come into play? [If you haven't heard of this, google "Rubens tube" or "flame tube"-- there's some interesting Youtube videos]

As much I enjoy Youtube for catching up on stupid cat videos, SNL skits and the like, I really hate it at work....

Many thanks for your thoughts-don't know what I'd do without this group--totally worth my ACS dues several times over!

Margaret

--

Margaret A. Rakas, Ph.D.
Manager, Inventory & Regulatory Affairs
Clark Science Center
413-585-3877 (p)

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--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas