From: "Geo" 

"Don Hills"  wrote in message
news:7w5PCtgaXKef092yn{at}attglobal.net...

> Kilowatt range UPSes often have a fan. My Sicon Socomec 1200w unit has
one,
> temperature controlled. Factoid: small UPSes (250 to 600 watt range) often
> don't have heatsinks big enough for continuous running. They depend on the
> battery going flat before the electronics overheat.

The 1200va doesn't have a fan, I've got half a dozen of the things and they
are completely silent.

Geo.

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