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Ah, in that case I'll continue to rant on about lofts and their >45°C summer temperatures (before adding hundreds of watts of server generated heat) as being bad places to put servers


Quite right - but when "needs must"... as Roger said.

So if you have no choice then:
* dust - use an enclosure and positive pressure.
* heat - use a thermostat and a source of coolish air

My servers run in an enclosed and insulated box and the extractor fan does a good job of swapping the hot air out - I think that's the main requirement. If we had month after month of 45degree heat then I'd be more worried. As it is I reckon the fan would only be running for a few days a year.

(And, to be clear, I agree that the loft is one of the *last* places I'd suggest for server location (probably better than the bathroom though))
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LittleBlueThing Running twin 30's