I also printed the recommended fan mount and had the same questions, which fell on deaf ears
so I designed my own, file attached, hope it helps
FANmount2_wDuct.stl (1.1 MB)
I also printed the recommended fan mount and had the same questions, which fell on deaf ears
so I designed my own, file attached, hope it helps
FANmount2_wDuct.stl (1.1 MB)