Hi Princeton!
This
1scf.min/ft2 winds up being 6 ACH with a 10' ceiling. For storage or use.
{10 cfm * 60 = 600 Cubic feet per hour; divided by 10 Cubic feet of projected floor
area = 6 ACH}
No matter what?
Really?
Dr. Bob Haugen
Director of Product and Technology Development
Flow Sciences, Inc.
910 332 4878
www.flowsciences.com
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From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
On Behalf Of Jeffrey Lewin
Sent: Monday, December 6, 2021 11:05 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Hydrogen gas exhaust
The 2020 edition has the following revision (in parenthesis):
Mechanical exhaust or fixed natural exhaust ventilation shall be provided at a rate of not less than
(0.0051 m3 / sec / m2) of floor area over the area of storage or use.
Good (?) morning,
I am trying to determine the minimum exhaust for hydrogen gas (not liquified) and see that in NFPA 55, section 6.17.3.2 requires a minimum exhaust of 1 scf/min/ft2. I had to look up scf--it is 'standard cubic foot' and is defined as 1
cubic foot of natural gas at 60F and normal atmospheric pressure.
If I know the size of the room and air changes per hour, is it possible to calculate my exhaust without doing an experiment?
MANY thanks!
Margaret
--
Margaret A. Rakas, Ph.D.
Lab Safety & Compliance Director
Clark Science Center
413-585-3877 (p)
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--
Jeff Lewin
Director of Chemical Laboratory Operations
Research Integrity Office
Michigan Technological University
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