From: Margaret Rakas <mrakas**At_Symbol_Here**SMITH.EDU>
Subject: [DCHAS-L] Hydrogen gas exhaust
Date: Mon, 6 Dec 2021 10:42:00 -0500
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: CAAszpkwrENFo+CXdZLdkRrkNbsw+5dCjKEHWAeV20e3q2oiQ4g**At_Symbol_Here**

Good (?) morning,

I am trying to determine the minimum exhaust for hydrogen gas (not liquified) and see that in NFPA 55, section 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 A. Rakas, Ph.D.
Lab Safety & Compliance Director
Clark Science Center
413-585-3877 (p)

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