Thanks for your response, nini804. I was hoping your suggestion was the correct one. But it turns out that the wall switch failed in such a way that the circuit remained open, or on, all the time. The good news is that it is a little quieter after being cleaned!

I would guess you can, but one big fan will work more efficiently than 2 small ones. I can't say for certain without seeing in person.

I have been searching High and Low for a replacement motor for my AUPU Bath Master Exhaust Fan - Model A716. It is the same as the Aero Pure A716. Neither AUPU nor Aero Pure have been responsive to my inquiries. If I need to replace the whole unit I will not buy an AUPU or Aero Pure.

In your last sentence of your first post your infer that a simple situation would of been black to black, white to white and ground to ground. So seems that what you were anticipating when you began removing the fan. But you also state while actually removing the fan, "It had three wires within conduit connected to it, those wires were orange, blue and grey. Then also connected to it was a separate set of wires coated in plastic, they were black, white, and a copper ground." Sounds like someone was trying to do a quick job during a commercial break or a halftime show maybe?? Anyway you say the orange, blue and grey wires from withing the conduit were definitely wired to the fan terminals? Or could they have been wire-nutted to the black and white wires from the NM cable? Then a pigtail from the wirenuts to the fan? Are the wires from within the conduit solid or stranded. Go CHIEFS