Roof-Mounted attic fan – complete?

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It has been a little while since I installed the fan (http://cwguy.com/?p=867) I added a switch and there are no bare wires running to the power now.

I need to try and dampen the sound the fan makes because the installer did a crappy job.  But now if I need to hear myself think, I can just turn the switch off.  I guess I fixed the problem?