Our old fan started to sound very loud. First we bought a new fan.
Our old fan started making a lot of noise. We first bought a brand new fan and found it didn't fit, so we had to find the exact right motor. This one fit perfectly.
Pros
This motor only works with the following NuTone Broan fans: Broan S90, Broan ACS90, Broan HS90, Broan MS90, Broan NS90, Broan S90