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Old 12-07-2009, 09:04 AM   #1
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Questions about ductwork for kitchen range hood


We're remodeling our kitchen and will be replacing the old ductless range hood with a ducted one. We also have an old fan in the wall that we will no longer need. We are thinking of feeding the hood duct into the opening of the old fan. This is different from seems to be a standard norm, i.e. feeding vertically through the ceiling and roof or feeding straight through the wall horizontally (e.g. as described on pg 2 of install instructions here: http://broan.com/display/router.asp?ProductID=1115). We are considering two possible paths for the duct. They are shown in red and in blue in the attached picture.
The red (vert) consists of 4 pieces:
- 33" up thru cabinet into ceiling
- 50" left
- 50" down
- out
The blue (hor) has 5:
- 12" thru back into wall
- 50" left (range wall)
- 20" left (sink wall)
- 20" down
- out

Here are my questions:
1. Would there be any potential problems with either path?
2. Is it possible to determine whether any given hood with its average or maximum CFM settings is powerful enough to work well with this amount of ductwork and number of turns? Are there any standards that would say that a duct route with that many turns of these types is equivalent to that many feet of straight ductwork and this much power is needed for this amount of ductwork?

Thanks much!
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Old 12-07-2009, 09:34 AM   #2
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Questions about ductwork for kitchen range hood


too many turns. Especially with the distance involved. Why not go out the side wall inside the soffit over the counter.

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Old 12-07-2009, 09:44 AM   #3
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Questions about ductwork for kitchen range hood


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Originally Posted by Bob Mariani View Post
too many turns. Especially with the distance involved. Why not go out the side wall inside the soffit over the counter.
We just want to use the existing hole instead of making a new one and covering up the old one.
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Old 12-07-2009, 09:55 AM   #4
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Questions about ductwork for kitchen range hood


Both are too long, too many bends
Grease will build up & become a fire hazard
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Old 12-07-2009, 10:21 AM   #5
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Questions about ductwork for kitchen range hood


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Originally Posted by Scuba_Dave View Post
Both are too long, too many bends
Grease will build up & become a fire hazard
If I am not mistaken there are other exhaust-type pipes coming out of the house. One is from sewer, if I am not mistaken. Can I connect the hood duct to it?
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Old 12-07-2009, 10:27 AM   #6
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Questions about ductwork for kitchen range hood


No, you can't connect a kitchen exhaust to anything else due to the grease
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Old 12-07-2009, 10:36 AM   #7
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Questions about ductwork for kitchen range hood


And these other lines you are referring to are way too small and are made with plastic which cannot be used to exhaust oil laden fumes from a stove. Spend the money to do it right or use the self venting option available on must units.
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Old 12-07-2009, 11:29 AM   #8
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Questions about ductwork for kitchen range hood


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Originally Posted by Bob Mariani View Post
And these other lines you are referring to are way too small and are made with plastic which cannot be used to exhaust oil laden fumes from a stove. Spend the money to do it right or use the self venting option available on must units.
I guess I don't have many options...

Given the same length and same number of terms, which type of duct is preferable in terms of grease accumulation etc: predominantly vertical or predominantly horizontal?

Thanks
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Old 12-07-2009, 12:38 PM   #9
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Questions about ductwork for kitchen range hood


Quote:
predominantly vertical
if this is the best path to take. Keep the length under 12 feet and 90 degree elbows less then 2 and you will be fine.
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Old 12-08-2009, 11:10 AM   #10
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Questions about ductwork for kitchen range hood


If I go horizontally through the wall so that the pipe comes out above the old fan, how far below the roof does the exhaust pipe need to be (see figure)? Thanks.
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Old 12-08-2009, 12:51 PM   #11
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Questions about ductwork for kitchen range hood


I recommend you vent straight up and through the roof.
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Old 12-09-2009, 12:16 AM   #12
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Questions about ductwork for kitchen range hood


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I recommend you vent straight up and through the roof.

i second that
if youre not gonna do it right i wouldnt bother doing it at all

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