[labnetwork] HEPA Filters

[Iulian Codreanu]

Good Morning.

Where are the prefilters some of you mentioned located? At the discharge 
of the makeup air units and recirc units, right?

Thanks for the feedback.

Iulian
---
iulian Codreanu, Ph.D.
Director, Penn NanoFab
200 South 33rd Street
Room 376 GRW Bldg
Philadelphia, PA 19104-6314
P: 215-898-9308
F: 215-573-2068
www.seas.upenn.edu/~nanofab

On 9/26/2012 5:26 PM, Paolini, Steven wrote:
> 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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