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Hi Linda,We had a similar problem. We have the working fan inside the cabinet, and 2 fans (taken out of old computers) blowing onto our top fitting. They aren't connected to the TC/EA power they just plug into the wall. 
But if you find an external source let us know!
Kim


On 10/10/14, "Reynard, Linda"  <[log in to unmask]> wrote:
> Dear Isogeochemists
> 
> Has anyone replaced the lower fan in a Thermo TC/EA (12 VDC, 250 mA), the one that blows on the lower part of the column? Ours has started making a louder-than-usual noise and I worry that its days are numbered. Thermo will sell us one very expensively. 
> 
> Any other sources for a replacement? If you have made the swap, how did you connect it to the TC/EA power source? 
> 
> Thanks!
> 
> Linda. 
> 
> 
> ------
> Dr Linda Reynard
> Department of Human Evolutionary Biology
> Harvard University
> 11 Divinity Avenue, Cambridge, MA 02138 USA
> tel: 617 495 8053
> 
>