So I found out that my RT-N66U became quite hot in this summer. It reached 65 degrees

Thus I've build my cooling flat of routers:


Within 15 minutes I got it back to 50 degrees
Those cheap laptop cooling pads are awesome

you can check the temperature through the hidden page: http://192.168.1.1/Advanced_Performa...ng_Content.asp
still left there after they removed the fan
tbh, consumers might not like a fan in a router, I think it would have been better.