I bought this model to replace one that failed after 15 years. My only dilemma was whether it would replace my 8663RM. The supplier listed the 8663RM as the one it would fit and after checking the Nutone website which had no information on the 8663RM I decided to order it. (I assumed the "M" was metal, which is my fairing, and the "P" was the polymer they make now; the fairing is not part of the fan motor.). My electrician came and installed it for me a few days ago - said it was perfect. Sounds good. Much quieter than the exhaust fan (different brand) in my other bathroom.
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