Since the 2012 Mac Mini came to live here (that’s Brisbane, Australia - hot humidity, come summer, like now), it has sat on its side with the tin-can lid leaning on the ‘top’ side. When I feel the heat, a small personal fan arrives at the desk and blows not on me (I’m tough) but straight into the Mini.How about trying the "pop the bottom” . . .. Enquiring minds want to know!
No measurements to offer, it just runs cool.