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Quietest inline fan for range hood exhaust Lacustral 09-14-2007
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Posted by Lacustral on September 14, 2007, 7:58 pm
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

PexSupply Save 10 468x60
Posted by Rick Blaine on September 14, 2007, 8:50 pm
lark@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.

You might want to check what code is before you invest a lot in this setup.
Seems to me there's issues with potential grease buildup on a remote fan for a
range vent that causes this to not be allowed.

--
"Tell me what I should do, Annie."
"Stay. Here. Forever." - Life On Mars

Posted by Jeff Wisnia on September 15, 2007, 7:32 pm
Rick Blaine wrote:
> lark@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.
>
>
> You might want to check what code is before you invest a lot in this setup.
> Seems to me there's issues with potential grease buildup on a remote fan for a
> range vent that causes this to not be allowed.
>
> --
> "Tell me what I should do, Annie."
> "Stay. Here. Forever." - Life On Mars

That makes sense, considering what the newspapers here in Red Sox Nation
said a couple of weeks ago when two Boston Firefighters lost their lives
because a burning double ceiling above the kitchen in a Chinese
restaurant collapsed on them.

A fire started above the "upper" of the two ceilings and it was stated
that it may have been burning for a couple of hours before the staff
noticed it and the Fire Department arrived.

The proximate cause was blamed on grease leaking from unsealed joints in
the stove exhaust hood duct and collecting above the higher of the two
ceilings for ages before something touched it off.

The article stated that the restaurant owner had dutifully paid a
"grease cleaning" contractor to service the exhaust system as required,
but whoever did the job skimped on checking the full duct run and/or
didn't refuse to do the job because they couldn't access to the full run
of the duct due to the "double ceiling" situation.

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.

Posted by dadiOH on September 15, 2007, 8:56 am
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*.

I have no idea which is quietest; however...

1. I have a Broan. Don't recall the CFM but it is maybe 10-12". No
speed control

2. It is about 25' from cooktop

3. The only way we can tell it is running is by looking at the
switch...I used a switch that lights an LED when the switch is on.

Be sure your hood fabricator includes a grease trap - that's just
coarse wire mesh - that is easily removed for cleaning.

--

dadiOH
____________________________

dadiOH's dandies v3.06...
...a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico




Posted by -zero on September 15, 2007, 12:40 pm


> 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*.

This is nice and quiet, and IMO, better quality then the others
you'd mentioned.

http://us.exhausto.com/files/pdf/Brochures/3921002.pdf


-zero


>
> Laura



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