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March 2007

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Tue, 13 Mar 2007 11:39:22 +0200
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If the fan blades are in grounded bare metal, I don't think a problem 
would occur, provided that the RH is maintained at 50% or more. If the 
fan blades are plastic or are plasticised (including paint), then I 
could foresee a potential problem (pun intended, to stop Dewey from 
intervening!). However, like all ESD questions, have you ***measured*** 
the results? Anyone can say anything and be right or wrong. Only 
measurements can justify any measure you take.

In any case, would not suitable airconditioning be a better solution?

Brian

Joel Alexander wrote:
> Has anyone had any experience assessing if personal fans could have an 
> adverse effect on an ESD control program.  We have ionizers on our 
> compressed air sources used to clean or dry assemblies but we have no such 
> policy for fans.  We just transitions to lab coats with 13% carbonized 
> nylon. Our policy when sitting is to wear a wrist strap that is tied into 
> an approved ground or have the wrist strap connected to a shirt sleeve and 
>  your pocket button attached to an approved ground. Many employees 
> complain that they are hot and I can see a lot more fans being used. 
> 
> 
> 
> Joel Alexander
> Quality Assurance Manager
> TT APSCO, INC. 
> 
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