From the manual 17.72*15.75*14.76 inches.
It blows hot air constantly out the back, center, top when in use and it states it needs 110mm at the back. In my case the drywall behind it gets really hot when cooking at high temp. So I keep it further than recommended.
The tray that comes with it is 13.5" x 10.5".
The opening is 7" x 14.25". Depth from back to front edge is 11.75".