[labnetwork] HEPA Filters

[Paolini, Steven]

The general rule of thumb with HEPA's is at least a 20 year lifespan, the pre-filters take most of the contaminants out. As far as an indicator for when they need replacement, amperage draw on the fans should be baselined and checked at least annually for increased draw to maintain pressurization or if your setup uses variable frequency drives in a closed loop, look for an increase in speed over time.
   Steve

From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Vicky Diadiuk
Sent: Wednesday, September 26, 2012 7:51 AM
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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