How loud are attic fans?

Question

I am going to buy an attic fan to put in a light use room in my house that does not have air conditioning, also we do not have an attic, which rules out the possibility for a whole house fan. I am thinking about one of the two attic fans on the linked page.

http://www.nutonesales.com/attic.html

Answer 1

get a 2 speed fan  so the lower speed will be quieter when you need it to be.

Answer 2

I have an attic fan in my roof. It is fairly loud. I can hear it running in my bedroom that is about 30' away. Fortunately I wear hearing aids. When I take them out to go to bed, I can't hear it.