I have encountered dozens of these over the years. The best practice is not
to put them in a hood but to put them on a bench with a small exhaust
immediately over the door so that any fumes are removed when generated or
when the door is opened. Putting them in a hood only blocks the air flow of
the hood and often does a much poorer job of removing the emissions. Also,
since these are often used less frequently, they often migrate to the rear
of the hood and operations begin to be performed in front of them raising
the real potential that they become an ignition source. You might want to
look at the article below for more on the issue of what works (and does not
work) well in a hood.

https://www.linkedin.com/pulse/why-cant-we-put-hood-richard-palluzi/

Richard Palluzi
PE, CSP

Pilot plant and laboratory consulting, safety, design,reviews, and training
www.linkedin.com/in/richardppalluzillc/

Richard P Palluzi LLC
72 Summit Drive
Basking Ridge, NJ 07920
rpalluzi**At_Symbol_Here**verizon.net
908-285-3782

-----Original Message-----
From: ACS Division of Chemical Health and Safety On
Behalf Of Stella Julia Sommer
Sent: Saturday, May 11, 2019 9:44 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] Muffle Furnace Ventilation Requirements

Dear all,
I recently started my new position as a instructional support technician at
my local university.
I am also supposed to manage the graduate laboratory. This is where I
encountered a room with a muffle furnace that just vents into the room. It
is set to 550 Deg. Celsius and used to ash plant tissues and food samples.

It is my understanding that those furnaces are supposed to have a separate
ventilation or should at least be located inside of a fume hood
(particulates, smoke, carbon monoxide ...).

Does anyone have a specific reference that describes the issue (standard,
regulation, case study...)?

Thank you very much!

Best Regards,

Stella Sommer

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