[labnetwork] Filter replacement inside the lab

[Paolini, Steven]

Please clarify whether you are referring to the pre-filters Upstream of the air handlers) or the actual HEPA filters in the ceiling downstream from the air handlers. In my experience, HEPA’s are never replaced. The best way to determine if the HEPA’s are struggling is to compare the motor amperage draw on the VFD’s with a baseline to the present readings. You must of course, run the motors at the same speed for comparison. If the filters are struggling, the amperage will be lower for a given speed, sort of like a shop vac when the inlet is clogged.

Steve Paolini
Principal Equipment Engineer
Harvard University Center for Nanoscale Systems
11 Oxford St.
Cambridge, MA 02138
617- 496- 9816
spaolini at cns.fas.harvard.edu
www.cns.fas.harvard.edu

From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Jasper Nijdam
Sent: Tuesday, April 10, 2018 1:16 PM
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] Filter replacement inside the lab

Heho All,
Our HEPA filters are mounted such that we have to replace them from the inside of the lab. Can anybody share an SOP on how to do this while minimizing the amount of dust polluting the lab?
Also, while I have your attention: Does anybody know a reliable repair service for our very old Dektak 3030?
Thanks,

--
Jasper Nijdam
Technical Manager GNuLab, Georgetown University
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