I was reading the directions for this fan and noticed that they mentioned it wasn't recommended for locations that get over 104F.
It made me wonder why would it be so low condidering that most people put bathroom fans in the attic - and I wouldn't be surprised to find my attic getting over 104F in the summer. Would a fan like this only be recommended for cold climates, do manufacturers even make this kind of distiction?
Unless your fan was sucking 104-degree (plus) temperatures from the bathroom, it should be fine.
So the 104 they are referring to is the intake air, not the ambient surrounding the unit.
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I would assume the rating would be for ambient and based on the motor temperature rise to keep it under whatever was the design temp.
It's probably all right at the ceiling as temperatures won't be _too_ much over 100F right at the outlet and while running the air flow through it will tend to cool it some. Does sound a little marginal design for the application though, although I must admit I've never looked at that spec for an exhaust fan...
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I don't know that fan in particular but some use paper blades that are pretty much junk and probably cannot stand up to the heat.
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