[labnetwork] HEPA Filters

[Bill Flounders]

Colleagues,

UC Berkeley can substantiate Phillippe Flückiger observations about HEPA 
longevity. The Microlab began operations in 1984 and during its 26 year 
life-cycle we never had to replace a HEPA filter because of particle 
loading. However, the pre-filters were replaced ~ every 2 years. I 
should qualify this by pointing out the HEPA's in use were the common 
type, made of spun-borosilicate and were thus "tortuous path filters" 
and not "absolute", i.e they operated by electrostatic force rather than 
by absolute pore size.

When and if the NanoLab, whose facilities supersede the Microlab 
requires HEPA replacement it is likely we will have to pay for them. The 
pre-filter replacements are covered by the Campus.

Bob Hamilton

Bob Hamilton
Marvel NanoLab
University of CA at Berkeley
Rm 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
bob at eecs.berkeley.edu
(e-mail preferred)
510-809-8600
510-325-7557 (mobile - emergencies)

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] *De la part de* Dennis Grimard
> *Envoyé :* vendredi 21 septembre 2012 00:17
> *À :* 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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