Up Dating Duct Work - HVAC - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 10-16-2012, 12:42 PM   #1
Join Date: Oct 2012
Posts: 1
Rewards Points: 10

Up dating duct work

Hi: I am currently replacing my old furnance with a new high efficency furnance. When I opened up the wall to expose the old duct work I noticed that their are 2 4" pipes supplying 1 special made boot in the living area. The house is sitting on a concrete slab so there is not much room. My question is can I have the 2 4" pipes go into a 8" oblong or round to elimate the extra space on the plenium. I am not handy with duct work, and the experts I call in can not figure out my problem either. Old house with bad ducts all around. Any help would be greatly appreciated. Thank you


Mr Ed is offline   Reply With Quote
Old 10-17-2012, 12:39 PM   #2
Join Date: Oct 2012
Location: California
Posts: 3
Rewards Points: 10

Hi Mr Ed. You mention that the ducts in your house are of poor quality. If they haven't been repaired in a while, it's likely that they're leaking or restricting airflow, thus wasting energy and raising your utility bills. This could cancel out the benefits of your new high-efficiency furnace. It might be a good idea to replace your ducts completely rather than seal them inside of another pipe.

Here are some resources about ductwork and HVAC efficiency:
The Engineering Toolbox: Sizing Ducts
Energy Star Duct Sealing
SBA Tips for Energy Efficiency (for small businesses, but the advice is still applicable)
furnacecompare.com: HVAC Ductwork

Have an expert inspect the ductwork for you. There is a good checklist on how to find a good HVAC contractor on pages 18-19 of this document: A Guide to Energy-Efficient Heating and Cooling.


fixup is offline   Reply With Quote
Old 10-17-2012, 07:35 PM   #3
An old Tradesmen
Join Date: Oct 2008
Location: Somewhere
Posts: 34,604
Rewards Points: 8,194

Posting a pic of your plenum and those pipes may help us help you.
beenthere is online now   Reply With Quote

Thread Tools
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
Advice for installing duct work for finishing basement captainj98 HVAC 1 05-11-2011 07:01 PM
Planning on New duct work..any feedback... kilosos2 HVAC 28 01-26-2011 09:21 AM
fans and duct work kjacobs4242 HVAC 2 09-26-2010 04:15 PM
HVAC duct work radiates 60Hz Mike in Arkansas Electrical 3 01-01-2010 07:29 PM
Toughest duct work I can get? napper HVAC 7 07-30-2008 10:52 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1