cooling my Krell monoblocks

All electronic lifetimes is lowered by heat.

The only thing I know of that really likes heat, is indeed, the Cat.

I had one sponteniously combust on me after it lay in front of a fireplace for a couple hours.

After having lived with Atmasphere MA-1s for a long time, I can sympathize with those of you who keep amps that require you to adjust your life in negative ways to live with them. (I used to spend time with women like that too.)

After many years, though, I did myself a favor and replaced them (the MA-1s, that is) with two Sunfire 600s (used) and hooked them up with Marigo Ultra 5 power cords. They generate no heat, I can leave them on all the time, and the sound is far superior.

So, my advice is to get rid of your life-impairing amps and find something else. You can do better, and you can live a happier, more normal life without them.

Loosening the fin bolts a "smigeon" is an interesting thought - can't hurt to give that a try. Collectively you have convinced me that a cooling fan is NOT a good idea. These are Krell fpb 350's that I really like - a while ago I let a pair of fpb 250's go and seriously regret it - they didn't click!! At least I now know that I'm not the only one suffering with clicks disease.

Thanks to each of you!

You let a cat spontaneously combust. Could you be anymore illustrative?? My word !
As for the fan and clicks ask Krell to tell you what you can do beside ignoring it which you can't. Be very firm and ask them to get an engineer to tell you that you may or may not use the fan . The big McIntosh amps had fans and may still but as the others have said the Chinese Oops I mean U.S. engineers have taken that into account. Just don't use ice and don't let a cat get toasty on the amps that would warm them even moreso.
Another idea is to go back to the 250s if they had enough juice for you. I bet a whole bunch of click loving 250 owners would trade up for 350s.
BTW who or what is Krell is it a derivative of an English root. I know Baleen whales and Whale sharks etc. eat "krill" a tiney shrimplike sea creature. Krell is owned by an Italian American. I think his is name Dan D'Agostino.