This was purchased as a direct replacement of the same model fan installed at least 10 years ago. The previous model gave very good service and as mentioned did so for at least 10 years. The Broan tech I spoke to suggested buying the entire fan assembly as opposed to just buying the replacement fan as the entire assembly would be cheaper than just the replacement part. I did so. I removed the motor, thermostat switch and fan from the assembly. I then installed it in the old ventilator. It fit perfectly and works well. My only complaint was the ground screw in the thermostat switch was not sized correctly or the hole wasn’t punched large enough. Using a socket wrench I was actually deforming the metal encasement of the thermostat switch trying to drive the grounding screw. I drilled out the hole a bit to try and it still did not want to drive and I was unwilling to drill the hole any larger. ...