MOTM

If you are using one of those typical Power One supplies where the
chassis is the heat sink, you should not screw it down directly to a
wood cabinet. You need to have some air circulation around the chassis
if you ever want to use the PS near it's rated output. The best bet is
to use at least 1/2" spacers to elevate the PS off the wood case.

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Regards,
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John Blacet
Blacet Research
http://www.blacet.com