Imac Intel Fan Speed/Air flow - Whats normal?

Hi,
I have had a intel imac for about a month now, and it is quiet. The air flow coming out of the back slot is warm air, BUT you can hardly feel the flow..
and now i have set up a another imac for someone at work and have a few more to do.
Anyway this other imac when started the fan was loud, not tooo loud but you could really hear it, BUT the airflow was cool air and it felt right that it should be cool air coming out and you could really feel the air. But now that i have moved it to another desk and put ram in it, and started it, the fan has quieted down like my imac and the air flow is warm and much warmer on the top left of the air vent slot.
- So what is right?, should we be able to hear the fan, or not?
- Should the air flow be cool or warm?
- Should you be able to feel the flow on your hand?
- Is the fan on a sensor, ie if it gets hot it works harder...
Both imacs are now quiet, one is more warm/hot than the other (as it is brand new), i think over time it will cool down....
- or it is pot luck what happens with them?
- Also if i get a temperature widget what would be normal
regarding the reading ?
thank you
rai

for temps this program works great
http://www.bresink.com/osx/TemperatureMonitor.html
and heres another thread
http://discussions.apple.com/message.jspa?messageID=2963306#2963306
it sound like your ram was the problem ( perhaps not seated right )
as far as the other thing check out the link above
good luck

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