I would agree with Bob. It is possible but would have to be done carefully, verify the filters work, good ongoing maintenance, detection for breakthrough. See ANSI std Z9.5-2012. Section on ductless hoods for more detail..

Lou DiBerardinis

Director. EHS Office

MIT

Sent from my iPhone

On Jan 26, 2015, at 8:42 AM, Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM> wrote:

Hi!

Doubtful it would work. Anything is possible, but this approach would be my last resort. My first option would be straight exhaust.

Reasons?

1) Charcoal filters primarily useful on organics.

2) Acids require activated filters which are tricky.

3) Give-back of filters when turned off.

4) Wide divergence on quality and support of companies making this type of filtered hood-some good many bad!

Very Truly Yours,

Dr. Bob Haugen

Director of Product and Technology Development

Flow Sciences Inc.

2025 Mercantile Drive

Leland, NC 28451

Phone 910 332 4878

From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of melissa.ballard**At_Symbol_Here**US.MICHELIN.COM
Sent: Monday, January 26, 2015 6:38 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] ductless fume hoods for acid digestion

Good morning all! I have to take a minute to get some additional opinions on a topic. I've been approached to provide my 2 cents on the appropriateness of using a ductless fume hood for acid digestion (preparing samples for analysis via AA). This would be for use in an industrial quality lab.

I have my opinion; what is yours?

Thanks!

Melissa D. Ballard, MSPH, CIH, CHO
Industrial Hygienist / Industrial Hygiene Chemist
Michelin North America
1401 Antioch Church Road
Greenville, SC 29605
864-458-1843
melissa.ballard**At_Symbol_Here**us.michelin.com

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