DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Plumbing Forum > Is there a solution for horizontal hood duct?




Reply
 
Thread Tools Search this Thread Display Modes
Old 02-23-2010, 06:40 PM  
ilyaz
Senior Member
 
Join Date: Jun 2009
Posts: 111
Liked 1 Times on 1 Posts
Likes Given: 22

Default Is there a solution for horizontal hood duct?

We are putting in a range hood in the kitchen. The X in the photo shows its approximate location. We want to have a horizontal duct as shown. However, the vertical studs are all 3.5" wide. We can't make the wall thicker since in this case we won't have enough space for the cabinets. Is there any way of feeding some sort of hood duct horizontally as shown without extending the wall?

If not, we will consider either a vertical duct or no duct at all, but that would be Plan B.

Thanks!



duct.jpg  
__________________
ilyaz is offline  
 
Reply With Quote Quick reply to this message
Old 02-23-2010, 07:27 PM  
Wuzzat?
Banned
 
Join Date: Jan 2010
Posts: 2,328
Liked 167 Times on 154 Posts
Likes Given: 94

Default

What dia. vent pipe is recommended for that distance?
How deep are the cabinets?
What's on the other side of the wall?



__________________

Last edited by Wuzzat?; 02-23-2010 at 08:03 PM.
Wuzzat? is offline  
 
Reply With Quote Quick reply to this message
Old 02-23-2010, 08:46 PM  
ilyaz
Senior Member
 
Join Date: Jun 2009
Posts: 111
Liked 1 Times on 1 Posts
Likes Given: 22

Default

Quote:
Originally Posted by Wuzzat? View Post
What dia. vent pipe is recommended for that distance?
How deep are the cabinets?
What's on the other side of the wall?
The hood we're getting is this: http://broan.com/ImageLibrary/broan/...es/626978C.pdf
It states that for horizontal it's "3¼” x 10” only"

The bottom cabinets along the hood wall is about 25 3/4".

On the other side are two bathrooms.
__________________
ilyaz is offline  
 
Reply With Quote Quick reply to this message
Old 02-23-2010, 09:01 PM  
Wuzzat?
Banned
 
Join Date: Jan 2010
Posts: 2,328
Liked 167 Times on 154 Posts
Likes Given: 94

Default

Quote:
Originally Posted by ilyaz View Post
The hood we're getting is this: http://broan.com/ImageLibrary/broan/...es/626978C.pdf
It states that for horizontal it's "3¼” x 10” only"

The bottom cabinets along the hood wall is about 25 3/4".

On the other side are two bathrooms.
If you can stand losing 3-1/4" out of your 25-3/4" deep cabinets you can run the duct through them.
This rectangular duct is 32.5" in² in area. If you can fabricate a duct 1" or 2" deep by whatever height it takes to make the same cross sectional area, that might work and it would hardly infringe on your cabinet depth. But, people usually don't make ducts shaped like this, and probably for good reason.

Maybe you could run several small round ducts to make up the duct area.

This hood has uses up to 300 CFM, which would be an air velocity of 300/[32.5/144] = 1400 FPM in that duct. I'd think air moving that fast would be noisy.
You might want to use
Engineering ToolBox
or other sites to check how well different duct shapes will work.
Maybe at the distant end you'd need a booster fan.

Work all this out before you lift a hammer.
__________________

Last edited by Wuzzat?; 02-23-2010 at 09:16 PM.
Wuzzat? is offline  
 
Reply With Quote Quick reply to this message
Old 02-23-2010, 09:14 PM  
ilyaz
Senior Member
 
Join Date: Jun 2009
Posts: 111
Liked 1 Times on 1 Posts
Likes Given: 22

Default

Quote:
Originally Posted by Wuzzat? View Post
If you can stand losing 3-1/4" out of your 25-3/4" deep cabinets you can run the duct through them.
This rectangular duct is 32.5" in² in area. If you can fabricate a duct 1" or 2" deep by whatever height it takes to make the same cross sectional area, that might work and it would hardly infringe on your cabinet depth.
Hmm, I need to think about this one. Actually, I would be cutting through the wall cabinets not the bottom cabinets, and the wall ones are certainly not as deep (not sure about their exact depth).

Are you saying that two ducts with the same area, lengths and number of turns are identical in terms of how well the air pushed through them, how loud they are etc?

Thanks.
__________________
ilyaz is offline  
 
Reply With Quote Quick reply to this message
Old 02-23-2010, 09:23 PM  
Wuzzat?
Banned
 
Join Date: Jan 2010
Posts: 2,328
Liked 167 Times on 154 Posts
Likes Given: 94

Default

Quote:
Originally Posted by ilyaz View Post
Are you saying that two ducts with the same area, lengths and number of turns are identical in terms of how well the air pushed through them, how loud they are etc?

Thanks.
Most of our wall cabinets are 12" deep.

The total area of separate ducts may have to be more than 32.5 sq. in.
The engineering site may tell you how many of what size round ducts is equivalent in resistance to the rect. duct.
You'd have to have a sheet metal shop make up a manifold to go from the hood opening to these round ducts, or you could do it yourself. I'd make a cardboard mockup first. If you don't round the corners air turbulence messes up the calculations and makes noise.
__________________

Last edited by Wuzzat?; 02-23-2010 at 09:26 PM.
Wuzzat? is offline  
 
Reply With Quote Quick reply to this message
Old 02-23-2010, 09:56 PM  
inspectorD
Housebroken
HRT_MODERATOR.png
 
inspectorD's Avatar
 
Join Date: Dec 2005
Location: Litchfield, CT
Posts: 4,117
Liked 134 Times on 112 Posts
Likes Given: 340

Default well

Are there soffits going in above the upper cabinets? and which way do the floor joists run.

__________________

Just My
Made in the

inspectorD is offline  
 
Reply With Quote Quick reply to this message
Old 02-23-2010, 10:22 PM  
ilyaz
Senior Member
 
Join Date: Jun 2009
Posts: 111
Liked 1 Times on 1 Posts
Likes Given: 22

Default

Quote:
Originally Posted by inspectorD View Post
Are there soffits going in above the upper cabinets? and which way do the floor joists run.
No soffits.

Joists parallel to the red line in the photo (I think)
__________________
ilyaz is offline  
 
Reply With Quote Quick reply to this message
Old 02-24-2010, 06:47 AM  
inspectorD
Housebroken
HRT_MODERATOR.png
 
inspectorD's Avatar
 
Join Date: Dec 2005
Location: Litchfield, CT
Posts: 4,117
Liked 134 Times on 112 Posts
Likes Given: 340

Default well

If you can, run the ductwork in the joist cavity, just sheetrock the inside of that bay for fire codes...check with your local building official first.

Other than that, they also make downdraft hoods..which is better than nothing.But $$

__________________

Just My
Made in the

inspectorD is offline  
 
Reply With Quote Quick reply to this message
Old 02-24-2010, 04:00 PM  
Wuzzat?
Banned
 
Join Date: Jan 2010
Posts: 2,328
Liked 167 Times on 154 Posts
Likes Given: 94

Default

Or go through the wall and make a small
http://www.enonhall.com/images/04132006/duct.jpg
in the bathroom.

With large CFM blowers, if you have gas appliances, careful you don't remove too much of the Combustion Air from your house.



__________________

Last edited by Wuzzat?; 02-24-2010 at 04:10 PM.
Wuzzat? is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Horizontal Pivot Rod milbel Plumbing Forum 5 03-04-2011 08:28 AM
Painting old wood horizontal siding intern.arch Roofing and Siding 2 08-26-2009 12:39 AM
Range Hood/Cabinets Over Island Stove allcash General Appliance Discussion 1 08-11-2009 12:54 PM
How do I change the oven hood? simplykirk General Home Improvement Discussion 2 09-30-2007 09:07 PM
zephir hurricane range hood asbestos General Home Improvement Discussion 0 02-08-2007 10:43 PM

Newest Threads

LATEST SPONSOR DEALS