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reduce range hood vent size or elbow it all over the place?

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reduce range hood vent size or elbow it all over the place? fourempties 08-18-2006
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Posted by Stormin Mormon on August 18, 2006, 10:01 pm
Area is based on the square of the diameter. So, 4 instead of 8 would
be 1/4 the area.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.

Let's see. Reduce the pipe size to less than 1/3 the manufacturer
requirements? Why not?

wrote:

>I have a high performance range hood that I need to vent up and then
>sideways about 10 feet to the outside. The manufacturer requires a 7"
>round duct. In order to use a 7" duct I'll have to vent it up, put in
a
>90, run it across the top of my cabinets, put in a 45 to get in front
>of a joist, then another 45 to get back straight, then a 90 up, and
>then a 90 to go to the outside. If I reduce it to a 4" duct, I can go
>up, put in a 90 and go straight to the outside.
>
>So, which is the lesser of the 2 evils? Any help would be very much
>appreciated.


--
Every morning is the dawn of a new error...






Posted by Stormin Mormon on August 18, 2006, 10:06 pm
First, refer to the book.

Second, since area relates to the square of the diameter, your 4 inch
pipe is (about) a quarter of the area of the 7 inch.

My best SWAG is that the longer 7 inch pipe will flow a lot more air.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.

I have a high performance range hood that I need to vent up and then
sideways about 10 feet to the outside. The manufacturer requires a 7"
round duct. In order to use a 7" duct I'll have to vent it up, put in
a
90, run it across the top of my cabinets, put in a 45 to get in front
of a joist, then another 45 to get back straight, then a 90 up, and
then a 90 to go to the outside. If I reduce it to a 4" duct, I can go
up, put in a 90 and go straight to the outside.

So, which is the lesser of the 2 evils? Any help would be very much
appreciated.



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