Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 05-27-2009, 09:39 PM   #1
Newbie
 
Join Date: May 2009
Posts: 10
Rewards Points: 10
Default

Help moving ductwork in order to finish my basement


I'm wanting to finish my partial basement (300 sq.ft.) to make an extra den living space, but have some low ductwork that I need to move in order to get the right ceiling height.

As you can see in the photos, there are two ducts dropping down from a cold air return that connect to the unit. What I want to do is patch the current connections and take the duct from the front of the return, go straight off the return into the crawl space on the left, follow along the framing in the crawl space, exit in the joists above the bottom of the stairs, and run an elbow down and into the top of the return in the unit (see photos and follow the red line to get an idea of what I am saying). This would be my ideal situation as all ductwork would then be in the joists.

My second option would be to run an elbow at the current unit connection up into the joists and run the ductwork across and through the joists (through each triangle section support) and into the side of the return following its current path. This is less ideal as I would at least have a soffit near the unit where the elbows are...but the ducts would at least be up in the joists.

Any problems with either option? Also, why do they have two ducts coming off of one return going into the unit? Can I use only one duct with either above option? Thanks.




Rhat is offline   Reply With Quote
Old 05-27-2009, 11:09 PM   #2
HVAC / Plumbing
 
Join Date: Feb 2009
Posts: 1,801
Rewards Points: 1,000
Default

Help moving ductwork in order to finish my basement


from your pics.. I can't see any reason as to why you can't move it to the end. As to why they used 2 .. They needed that much air .. If you only use 1 you will have to use a larger pipe . If your return has a divider...You will have to use 2 or take out the divider

kenmac is offline   Reply With Quote
Old 05-28-2009, 08:43 AM   #3
Member
 
Join Date: Sep 2008
Location: Upstate New York
Posts: 368
Rewards Points: 250
Default

Help moving ductwork in order to finish my basement


There is a science to duckwork. Go get a copy of ACCA's Manual D from your library and you will see what I mean.

Here's my thoughts:

Option 1: If I understand correctly, you can do that but adding another elbow or two will increase the static pressure of your return somewhat.

Option 2: Would be the same straight shot but in fact reduct your static pressure (good). But I am not sure you can pass the same sized ducts through those joists, at least I can't tell from here.

Whatever you do be sure to have the same cross sectional area of those two ducts (or more). Whoever designed your system clearly needed that volume of air.
dac122 is offline   Reply With Quote
Old 06-01-2009, 09:00 AM   #4
Newbie
 
Join Date: May 2009
Posts: 10
Rewards Points: 10
Default

Help moving ductwork in order to finish my basement


Thanks for the posts. The duct will fit throught the joists (see duct in first pic at top left). I might patch some metal on the side of the return since there is currently only the silver cardboard of the return on the sides and run the two 6" ducts out the side following the same path as now, but drop them into the top of the unit...if you imagine a rectangle, currently the path follows the right and bottom sides of the rectangle where the new path would follow the top and left sides of the rectangle.

Thoughts?
Rhat is offline   Reply With Quote
Old 06-01-2009, 11:17 AM   #5
Member
 
Join Date: Sep 2008
Location: Upstate New York
Posts: 368
Rewards Points: 250
Default

Help moving ductwork in order to finish my basement


Can't really imagine what you are describing. A diagram, or scanned written diagram, or mock up of your photos helps a bunch.

Regardless, if you can pass both ducts thru your joists that sounds like the preferred approach as you have little risk of increasing your static pressure.
dac122 is offline   Reply With Quote
Old 06-01-2009, 12:42 PM   #6
Newbie
 
Join Date: May 2009
Posts: 10
Rewards Points: 10
Default

Help moving ductwork in order to finish my basement


Quote:
Originally Posted by dac122 View Post
Can't really imagine what you are describing. A diagram, or scanned written diagram, or mock up of your photos helps a bunch.

Regardless, if you can pass both ducts thru your joists that sounds like the preferred approach as you have little risk of increasing your static pressure.
Thanks again for the post...here's a diagram of what I mean. The only issue I can forsee would be the return is not totally encased in metal (silver cardboard-like material on sides), so I would have to tac on some for the connection on the side of the return (where the red duct path meets the return in diagram) or also replace the entire return with a full sheet metal return. Thoughts?

Rhat is offline   Reply With Quote
Old 06-01-2009, 12:50 PM   #7
Member
 
Join Date: Sep 2008
Location: Upstate New York
Posts: 368
Rewards Points: 250
Default

Help moving ductwork in order to finish my basement


Okay, I understand you return sides are not sheet metal but perhaps duct board. Yes, just replace those sections with sheet metal. You may be able to just slide the sheet metal over the duct board. Get a bucket of duct mastic to seal all the small leaks and odd edges that may leak. Can't think of any other issues.
dac122 is offline   Reply With Quote
Old 06-15-2009, 09:57 AM   #8
Newbie
 
Join Date: May 2009
Posts: 10
Rewards Points: 10
Default

Help moving ductwork in order to finish my basement


Just wanted to thank you for the responses...I was able to move the duct work this weekend. I used two collars and connected directly to the ductboard with U181 tape to seal any leaks. Photos are below.


Rhat is offline   Reply With Quote
Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Basement - Removing or moving support post jfgagnon Remodeling 12 08-08-2011 08:11 AM
Finishing basement, had a few questions about ductwork... Wyjeep Plumbing 12 04-27-2010 10:27 PM
basement subpanel suggestions/advice desired ScottsName Electrical 4 02-26-2009 07:38 PM
moving basement toilet cibula11 Plumbing 10 10-20-2007 02:22 PM
How to 'start' finishing the basement... mcvane Building & Construction 18 06-04-2007 09:28 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.