"Donald Tsang" > wrote in message
...
> Vox Humana > wrote:
>>The 300 CFM fan in my microwave hood is very loud while the 600
>>CFM fan in my downdraft range is really quiet. Sometimes I can't
>>tell if it running.
>
> I'm pretty sure our downdraft has dual fans -- one inside the unit,
> and one mounted outside the house at the exhaust. Either that, or
> I have really noisy filters... we're going to install a "real" hood
> in our new house.

In my case the fan is under the range. I suppose it could be mounted in a
remote location, although I don't recall seeing that option offered in
installation instructions.

I wish I had a really good hood instead of what I have.