Ecnerwal wrote in message ...
In article ,
(Jeridiah) wrote:

For reference - fan is 8" with a baffle rated at 180CFM and 6.5
sonnes.

Egad. First thing would have been to pay attention to the sones rating
before purchase, or return it and buy one with a _much_ lower rating.

If you want to choke it down, it need not be all that complicated - put
a damper in the duct.

This was the only one that met other specs of the problem. In any
case, I did notice the sound rating. I did try it out at the store in
their bench display. I shut off all of the other fans and tried this
one by itself. It was noticeable, but not "loud". Some of the others
were barely audible. Again, I think this is due to the fact that they
are allowing the motors to cavitate the air and have very little "air
noise".

The "other" fans with sonnes ratings of around 2 also had cfm's of
about 40 and cost 5x what this one did. What exactly is a sonne? I
am aware of dB for rating sound, but don't know what sort of unit a
sonne is.