When its up to full speed I can hear it in the driveway. It makes a whirl noise at high rpm. I cant hear it inside, even in the bedroom adjacent to it. What I've seen for various fan models is the panel size varies quite a bit. The one at the home improvement stores don't spec wattage. Additionally the fan blades can be a bit smaller. Right after I did this I found a solar roof vent thrown to the curb. looks like a bad motor, but the panel is much smaller. I might build another for my upstairs attic if I find another cheap panel.
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