I have the T-10. Its a good unit, especially if venting forward is the only option. If you can vent to the back, the T-8 should be the winner. With smart fan turned on, you can adjust the speed and temp the fan runs at... but it is audible. I sit about 8' away. That said, if I am doing other things, the fan isn't disruptive. Just that it is audible. But it keeps my Marantz running cool. I will likely switch to the rear venting within the year. Had the T-10 since 2018. How often do you clean the fans on these units?