Running servers too hot?

How hot can 1U servers run, and where exactly do you take their temperature?

Can you measure the heat of their power supply exhaust or something?

I think we're running our servers too hot, but no one else believes
me, so I need some sort of evidence/proof.

They hang frequently, but my cow-orkers blame demons and ghosts.

-- 
We're just a Bunch Of Regular Guys, a collective group that's trying
to understand and assimilate technology. We feel that resistance to
new ideas and technology is unwise and ultimately futile.
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