[labnetwork] Cleanroom Pressure Setpoint

[Nicholas Menounos]

Hi Adam

In my opinion, anything that is measurably positive is adequate to keep particles out, with diminishing returns above .05”WC.

What is more important is control stability (set CFM offset, my strong preference vs control to DP), cascading gradients of connected spaces (vs pressure sinks of bio containment) and your risk tolerance.

At MIT.nano: Pregown is +0.02” relative to public corridor -> Gowning is +0.02” relative to pre-gown -> Cleanroom is +0.02” relative to gown = Cleanroom 0.06-0.07”WC relative to public corridor.

Nicholas Menounos, PE, LEED AP (he/him/his)
Assistant Director of Infrastructure

MIT.nano
Massachusetts Institute of Technology
77 Massachusetts Ave, Bldg 12-4003
Cambridge, MA 02139
Cell: (508) 932-0938<tel:+15089320938>
Office: (617) 253-7234<tel:+16172537234>
Email: Menounos at mit.edu<mailto:Menounos at mit.edu>

From: labnetwork <labnetwork-bounces at mtl.mit.edu> On Behalf Of Adam Pettigrew
Sent: Wednesday, April 6, 2022 3:53 PM
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] Cleanroom Pressure Setpoint

Hey All,

I am curious what others have as a setpoint for their cleanroom pressure relative to an unclean or lower classification cleanroom. I have found some information which suggests 10-15Pa is more than sufficient. We have ours set quite high at 60Pa but it typically sits at 45Pa. If you have tried adjusting the pressure, have you noticed any change in cleanliness/particle counts? Any information would be really appreciated.

Thanks,
Adam

--

Adam Pettigrew

Systems Technician

University of Alberta - nanoFAB

W1-028A ECERF Building

9107 - 116 Street

Edmonton, Alberta

Canada T6G 2V4 Ph: 587-879-1514
www.nanofab.ualberta.ca<http://www.nanofab.ualberta.ca/>
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