This maybe interesting to those that have alot of fan's or noisy one's in general, found this here http://www.heatsink-guide.com/ simple little temp controlled fan regulator,using very few parts, I've built one, it's still sitting on the test bench, trying different fans and adjustments, so far it's working good, maybe a nice cheap, effective circuit for those jet sounding whirlwind's, Worth a look. The link doesn't take you directly to the article, scroll down about half way down the page, look for the $4 fan control, there's actually 2 article's the one mentioned and a up date.
Burner