[labnetwork] Face Velocity for Wet benches/Fume hoods?

[Mac Hathaway]

Thanks to all for the helpful replies.  At CNS, we are using 100 fpm on 
our fume hoods and wetbenchs, per ANSI.  However, with the push for 
energy conservation, we're keeping our eyes open.

It is interesting to note that the possibility of 60 fpm appears to be 
bench-specific.  Has anyone tested their benches at this flow, 
successfully or not?  Was this in a clean room (with vertical air flow?)

Thanks again.


Mac Hathaway
Harvard Center for Nanoscale Systems





On 4/6/2012 10:11 AM, Joe Morgan wrote:
>
> Mac,
>
> See ANSI/AIHA Z9.5 for laboratory ventilation systems and worker 
> health.  In the past 100 feet/per minute has been the golden rule.  
> However, for a number of years now fume hood manufacturers have 
> created new designs that sometimes enable sash velocities as low as 60 
> feet/minute.  The hood must still pass testing and certification as 
> defined by ASHRAE 110.  I’m not sure how wet process benches or 
> laminar flow hoods fit into these standards.
>
> Best, Joe
>
> *From:*labnetwork-bounces at mtl.mit.edu 
> [mailto:labnetwork-bounces at mtl.mit.edu] *On Behalf Of *Mac Hathaway
> *Sent:* Thursday, April 05, 2012 3:09 PM
> *To:* Lab Network (labnetwork at mtl.mit.edu)
> *Subject:* [labnetwork] Face Velocity for Wet benches/Fume hoods?
>
> Hey all,
>
> What do folks currently consider satisfactory regarding the air-flow 
> face velocity at their fume hoods and wet benches?  Do you have any 
> ASHRAE/ANSI/SEMI-type standards or references that you draw on for 
> this purpose?
>
> The topic came up today in the context of energy savings, lab make-up 
> air, and this sort of thing...
>
>
> Thanks,
>
> Mac Hathaway
> Harvard Center for Nanoscale Systems
>

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