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Demystify: 

It also depends on the size of the containers, size of the room, and whether dispensing from large to small Dewars is part of the process. The number of air changes, I agree, seems pretty low. This may be helpful.

http://www.stfc.ac.uk/she/resources/pdf/sc03_appendix_3.pdf

George S. Smith III
Corporate EH&S Manager
Thermo Fisher Scientific
6722 Bickmore Ave.
Chino, CA 91708
909-393-6097 (O)
484-951-9832 (M)

-----Original Message-----
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Brian T. Mars
Sent: Friday, March 08, 2013 8:11 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: Re: [DCHAS-L] Liquid nitrogen storage

A lot depends on how many containers in what size room.

-Brian

----- Original Message -----
From: "Ralph B Stuart"
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Sent: Friday, March 8, 2013 9:40:28 AM
Subject: [DCHAS-L] Liquid nitrogen storage

Does anyone have a rule of thumb for a ventilation rate in a room which is being used to store liquid nitrogen containers? Several credible web sources recommend a "well-ventilated area" without mentioning numbers. We have a room under consideration for this purpose with about 1 air change per hour. This seems low to me, but I thought I would sanity check it with DCHAS-L.

Thanks for any help with this.

- Ralph

Ralph Stuart CIH
Chemical Hygiene Officer
Department of Environmental Health and Safety Cornell University

rstuart**At_Symbol_Here**cornell.edu