I have an enclosed cabinet and my HR20 is running at 129. I bought something similar (http://www.xpcgear.com/allaldualnot.html) and it brings the unit temp down to about 124. I don't think $20 was worth a 5 degree drop and 129 is well within normal. It's not the most powerful of fans, but again, even enclosed, I'm not running into heat issues.
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