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Ralph Mowery

In article ,
says...

But the roofer who came yesterday wants to replace it, because he says,
it's rusting.

He also says the new one will be better, new thermostat, new humidistat.

My current thermostat works fine, I never take steamy showers or baths
so I don't need a humidistat.

I do believe there is some rust (maybe at the outer edge of the frame)
and around the holes where I nailed the fan to the plywood 35 years ago.
But I doubt if there is much and new nails can be put in an inch away
from the old nails, where I'm sure there is no rust at all. Will take 3
minutes.

So is there any reason to replace the fan?

You may want to do like I did and replace the roof fan with a ridge
vent. You eliminate all mechanical and rust problems.