Product review (4 stars): Replacement fan since original can not be serviced
Improved model with two blowers,it is load but so was the original.  Main complaint was mounting did not match 18" studs of older model and I had to redo some drywall. Exhaust size goes from 10" inches to the original 6" in the wall.  All fixable but more work than I thought.  I've read about switches, same as on old unit and they are fine, not great but fine.  Best news is I can use my grill pan again since my BBQ is under feet of snow