What speakers are you using?
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First check to make sure that there are no restrictions to air flow to the amp. If not, then yes you can use fans, but if your Def techs are a current model w 92 db 8 ohm sensitivity and you are pushing a 200 wpc amp so hard it goes into thermal shutdown, you might want to consider going w a pro sound reinforcement system (and buying stock in hearing aid companies)!!!! Really, dude, Unless your "party room" is the size of an auditorium, that amp should be able to push those speakers to 110-120 dB levels which will toast your ears pretty quickly.
Try taking the cabinet cover off the amp, so more air can circulate. I have a McIntosh MC402 and MD205, both in a audio cabinet. I have only had my 205 go into thermal shutdown once for a movie. I cut 4 2.5" holes inthe bottom of cabinet(audio not amp) and that let more air convect thru to dissapate the heat and never have had an issue again. As far as the 402 it has never had an issue with heat.