Induced draft-Fied power venter question

I see Field controls offers a stainless steel residential 4" venter along with the standard aluminum one for about $100 more (Supply house.com)
Wondering what exactly which part is stainless and different from standard model.
I only see them go 8-12 years anyway before the motor goes (even using their 2-3 drops of $21.00 oil every year or a motor mounting bracket breaks or a mouse gets caught in the wheel :)
Anyone see the benefit to paying the extra $100 for the so called stainless version?
Thanks!
Via RSSMix.com Mix ID 8247361 http://www.rssmix.com/

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