From: "Al Bundy" 
Newsgroups: misc.consumers.house
Subject: Re: range hood vent ductwork
Date: 19 Jun 2005 04:50:08 -0700
   posting-account=D5Fg-QwAAABqAj2EpINvkx0-TCKD7DGz



haucy wrote:
> Hi,
>
> I am going to install a vented(horizontal) range hood in my new house.
> My builder setup the ductwork as following: range to duct and then
> straight DOWN about 6 ft and then a 90 degree bend (another 6ft) to the
> outside.
>
> I don't think this would work.  The efficiency is going to be very very
> poor.  I need some proof and support to convince my builder.
>
> What do you think?
>
> Thanks,
>
> haucy

It sounds like you don't have the option of going straight up or out.
So the vent fan has to have enough power to push extra air. That's what
to concentrate on. I think your setup will have a tendency to form
condensation at the 90=B0 bend. Running the fan longer after cooking
will help.