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Posted by RickH on September 17, 2007, 11:28 am
On Sep 14, 6:58 pm, l...@adore.lightlink.com (Lacustral) wrote:
> I'm planning to use an inline fan for a range hood - I'm going to have the
> canopy made by a metal fabricator. I'm putting the fan in the attic.
> I'm looking for something
>
> - about 300 CFM max
> - can be speed controlled about all the way to 0.
> - doesn't make a hum or whatever when speed controlled.
> - Absolutely as quiet as possible.
>
> I've heard that if you compare a small fan with a large fan that's turned
> down with a speed control to move the same CFM as the small fan, the large
> fan will be quieter.
>
> Somebody at Fantech told me this wasn't true, that the noise just depends
> on the CFM the fan is moving. I don't believe this (she said other very
> dubious things), because I've heard elsewhere that a larger fan will be moving
> with a lower RPM when it's moving the same amount of air, so it would be
> quieter.
>
> So, I figure I'd get about a 300 CFM fan and turn it down with a speed
> control. My range is very small and it doesn't need a big fan.
>
> Some fans make a low-voltage hum when you use a speed control on them.
> Fantech said their fans do. Someone at Broan told me their inline duct
> fan doesn't have a low-voltage hum when speed controlled. I don't know how big
> of a deal the low-voltage hum is, compared to the noise from the fan
> motor.
>
> What inline fans are quietest? They don't have a standard way of testing
> the noise from them, unfortunately.
>
> I know stuff about reducing the noise that's moving through the duct -
> duct silencer, liquid soundproofing you can spray inside the duct. Etc.
> etc. My question though is about the quietest *fan*.
>
> Laura
Consider an exterior wall fan, then you wont have to worry about
grease in the attic, or noise, heres one:
http://www.rewci.com/faexfa.html
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