Can you control iMac fan?

I have two iMacs--one two years old that runs hotter than the one purchased last month.  Is there a setting to control the fan speed to cool down the older iMac?

I put in a ssd & bigger hdd using the ifixit.com kit and directions, then bought the fan control software from http://www.hddfancontrol.com.  Took 3 hours, but everything works fine and is very fast & quiet.

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