[labnetwork] HEPA Filters

[Jörg Hübner]

Hi,
we had a change of HEPA filters after around 7 years in the older part of our cleanroom. It was necessary as it was increasingly difficult to keep the overpressure in the cleanroom at the desired level. The reason for the "only" 7 years lifetime was most certainly a defect pre-filter (completely blown through) at the air intake.
In general there might also be an aspect of energy conservation as it takes more pressure to press air through old, used filters (we had our fan motors running at or close to 100% for quite a while before we exchanged filters) . Central University (Campus Services) paid for the exchange.
The " lesson learned"  for us is to check the pre-filters once in a while.

    Regards
                                    Jorg












Jörg Hübner

 Director

DTU Danchip
National Center for Micro- and Nanofabrication



Technical University of Denmark

[cid:image001.gif at 01CD9C8B.A9E00330]

Danchip

ØrstedsPlads

Building 347

2800  Kgs Lyngby

Direct +45 4525 5762

jhub at danchip.dtu.dk<mailto:jhub at danchip.dtu.dk>


www.danchip.dtu.dk<https://micmail.mic.dtu.dk/exchweb/bin/redir.asp?URL=http://www.danchip.dtu.dk>













From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Vicky Diadiuk
Sent: 26. september 2012 13:51
To: Dennis Grimard
Cc: labnetwork at mtl.mit.edu
Subject: Re: [labnetwork] HEPA Filters

HI,
 The answer for MTL is the same as EPFL's, except that our HEPAs have been unchanged since 1985 :)
Vicky

On Sep 25, 2012, at 4:22 AM, Flückiger Philippe wrote:


Dear Denis,

Let me mention that EPFL is running with the original HEPA filters since 14 years (1998) and still reach the class 100 specifications.
EPFL has no plan to change the HEPA filters. Only some pre-filters might be occasionally changed for example after construction work in the area.

Anyway, back to your question facilities would pay for this.

With my very best regards,
Philippe

Dr Philippe Flückiger
Director of Operations
http://cmi.epfl.ch/
Phone +41 21 693 6695

De : labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu> [mailto:labnetwork-bounces at mtl.mit.edu] De la part de Dennis Grimard
Envoyé : vendredi 21 septembre 2012 00:17
À : labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>
Objet : [labnetwork] HEPA Filters

All:

Do any of you have to pay for the replacement of your HEPA filters in your cleanrooms?

Thanks ...

--
Dennis S Grimard, Ph.D
Managing Director, Lurie Nanofabrication Facility

University of Michigan
1246D EECS Building
1301 Beal Avenue
Ann Arbor, MI 48109-2122
(734) 368-7172 (Cell)
(734) 647-1781 (Fax)
http://www.lnf.umich.edu

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