Flex Versus Alum Or Steel - HVAC - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 11-03-2011, 10:24 PM   #1
Join Date: Nov 2011
Posts: 1
Rewards Points: 10

flex versus alum or steel

I was considering replacing the "flex" tubing/duct work that goes from my central air unit to my daughters bedroom with regular aluminum/steel duct work that could be wrapped with more insulation. Her bedroom only has one inside wall and consequently is the coldest room in the house. Is there any advantage to "traditional" duct work over "flex"? Also, is it possible to wire a step-up fan into the duct to help with the circulation. There is probably a 30 ft. run from the main unit to the bedroom. Is this done commonly? Can an extra fan be wired to activate when the central unit comes on?


niceguy525 is offline   Reply With Quote
Old 11-03-2011, 10:50 PM   #2
Join Date: Mar 2011
Location: Ohio
Posts: 1,646
Rewards Points: 1,000

regular ductwork will work much better then the flex because there is less resistance to the air flow since its smooth on the inside. you should be able to wire a booster fan in the line. i'm sure someone with more electrical experience than me will be along to tell you how to do it.


DannyT is offline   Reply With Quote
Old 11-04-2011, 12:40 AM   #3
Join Date: Jul 2011
Posts: 615
Rewards Points: 500

You can pick up sometimes 25% more cfms with hard duct.Depending on the size of the room you may even want to increase the size of the duct.
Now why do I get the feeling that there is no return air grille in that room?You may have to leave the bedroom door open if there is no return air grille.
Cutting a gap in the bottom of the door rarely works good.
Fans like the one you are talking about are loud especially when you are trying to get to sleep,create drafts,and rarely provide comfort.
REP is offline   Reply With Quote
Old 11-04-2011, 06:26 AM   #4
Join Date: Mar 2010
Posts: 2,344
Rewards Points: 1,216

If your just adding an additional run to a bedroom off the main I would recommend running flex, it's the easiest for a DIYER and you can bend it around obstacles and it don't have to be an exact length. One run off a main system makes no difference, many states in warm climates that's all they run in attics.
COLDIRON is offline   Reply With Quote
Old 11-04-2011, 07:25 AM   #5
biggles's Avatar
Join Date: Jan 2008
Location: Long Island
Posts: 3,630
Rewards Points: 2,000

if the walls get chilled out in the winter you need to insulate first. you need to hold what heat is going in then see what needs to be done.might consider a duct heater with a seperate stat and the fan add on.might consider adding a return back to the actual furnace would pull some of the chill out

Last edited by biggles; 11-04-2011 at 07:28 AM.
biggles is offline   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
High Rise Building methods - US versus Oz - Steel versus Concrete Jado Off Topic 17 09-15-2011 08:47 PM
Wood or Steel wall studs? dredogol Building & Construction 2 07-10-2011 07:31 AM
Galvanized steel versus cast iron ce7375 Building & Construction 1 04-11-2011 06:09 PM
Floor bounce joist sistering joehomeowner Building & Construction 24 05-10-2009 01:50 PM
"Maintenance Free" Siding Materials (Vinyl, Steel, Fiber Cement) diggitydog Building & Construction 12 01-23-2009 04:24 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1