 |
|
12-03-2008, 12:55 AM
|
#1
|
|
Newbie
Join Date: Dec 2008
Posts: 4
|
Attaching Flex duct to register boot
I am running a 5 inch duct run using flex duct (type F090) to a register boot. My question is, since the flex duct is the same diameter as the register boot, how to a fit the flex over the register boot? Do I crimp the register boot so the flex will fit over it or do I need a coupler?
|
|
|
Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. DIYChatroom.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any home improvement task!
|
12-03-2008, 01:13 AM
|
#2
|
|
Member
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 2,422
|
What is the reason for so small a diameter flex?
__________________
Just slow, not stupid.
|
|
|
|
12-03-2008, 01:17 AM
|
#3
|
|
An old Tradesmen
Join Date: Oct 2008
Location: Lanc PA
Posts: 3,691
|
It slides over.
Takes a little practice.
|
|
|
|
|
12-03-2008, 03:26 PM
|
#4
|
|
Newbie
Join Date: Nov 2008
Location: North and East Texas
Posts: 28
|
Don't forget to prelube with mastic and use a tie strap over the liner then the insulation jacket.
|
|
|
|
|
12-03-2008, 04:26 PM
|
#5
|
|
Member
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 2,422
|
Hey deltex why mastic?
I freely admit that I use all rigid pipe and very little flex.
I would pull back the outer insulation, push the flex on the fitting, zip tie that, and then push the insulation over the flex duct and fitting and duct tape with approved tape.
What am i missing on mastic?
__________________
Just slow, not stupid.
|
|
|
|
|
12-03-2008, 05:17 PM
|
#6
|
|
Member
Join Date: Sep 2008
Posts: 209
|
Quote:
Originally Posted by hvaclover
Hey deltex why mastic?
I freely admit that I use all rigid pipe and very little flex.
I would pull back the outer insulation, push the flex on the fitting, zip tie that, and then push the insulation over the flex duct and fitting and duct tape with approved tape.
What am i missing on mastic?
|
You should tape the flex (plastic liner) to the boot after putting on the panduit strap. Then you pull the insulation over that and tape the exterior liner to the boot as well.
|
|
|
|
|
12-03-2008, 05:19 PM
|
#7
|
|
Newbie
Join Date: Dec 2008
Posts: 4
|
It is uninsulated because it is in a conditioned area. The flex definately does not fit the "torpedo" stile register boot. I called the HVAC place were I purchase it and he said the I would have to crimp the register boot to get it to fit. Would crimping the register boot disrupt the air flow bad enough that this would not be advised. Do they make register boots that have a male end to attach flex to?
|
|
|
|
|
12-03-2008, 05:37 PM
|
#8
|
|
Member
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 2,422
|
Quote:
Originally Posted by bluefitness
You should tape the flex (plastic liner) to the boot after putting on the panduit strap. Then you pull the insulation over that and tape the exterior liner to the boot as well.
|
Heh, I just read the instruction. I don't do enough flex to claim any real expertise in whole system design. But we do kinda specialize in (that is to say each job we've done has been a success) in correcting badly heated home additions.
__________________
Just slow, not stupid.
Last edited by hvaclover; 12-03-2008 at 05:58 PM.
|
|
|
|
|
12-03-2008, 06:54 PM
|
#9
|
|
Member
Join Date: Jan 2008
Location: Long Island
Posts: 718
|
take a niddle nose pliers and grab the end of the duct about 2" down 1/4 turn the edge all the way around and that will narrow it down to accept the 5" now to attatch it....wrap the end with one full around lenght of duct tape.slip the flex on ,and again the full around duct tape then zip screw it into the duct.if it was insulated you then would pull the insulation over the screws and duct tape that.....the key word here is DUCT TAPE  .....2 pieces of duct tape aren't coming apart.
|
|
|
|
|
12-03-2008, 07:05 PM
|
#10
|
|
Member
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 2,422
|
Quote:
Originally Posted by biggles
take a niddle nose pliers and grab the end of the duct about 2" down 1/4 turn the edge all the way around and that will narrow it down to accept the 5" now to attatch it....wrap the end with one full around lenght of duct tape.slip the flex on ,and again the full around duct tape then zip screw it into the duct.if it was insulated you then would pull the insulation over the screws and duct tape that.....the key word here is DUCT TAPE .....2 pieces of duct tape aren't coming apart. |
SCREWS? 
Not criticizing, but wouldn't you worry about the flex ripping? I know you used duct tape but I have seen it come loose over the years and the screws rip loose.
Just asking, like I said flex is not my specialty.
__________________
Just slow, not stupid.
|
|
|
|
|
12-03-2008, 07:07 PM
|
#11
|
|
Newbie
Join Date: Nov 2008
Location: North and East Texas
Posts: 28
|
Quote:
Originally Posted by hvaclover
Hey deltex why mastic?
I freely admit that I use all rigid pipe and very little flex.
I would pull back the outer insulation, push the flex on the fitting, zip tie that, and then push the insulation over the flex duct and fitting and duct tape with approved tape.
What am i missing on mastic?
|
I may be overdoing it but flex is known to get kicked around and pulled on after installation. The weakest link is the connectors at the take offs and jack boots. The mastic glues it solid so you don't have to rely on the zip alone to hold it. I just zip the insulation and now you have me thinking about taping that for more support.
The mastic also really does lubricate it to make slipping it over the fitting easier and it holds it in place while zipping it tight.
|
|
|
|
|
12-03-2008, 07:09 PM
|
#12
|
|
Member
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 2,422
|
Quote:
Originally Posted by Daltex
I may be overdoing it but flex is known to get kicked around and pulled on after installation. The weakest link is the connectors at the take offs and jack boots. The mastic glues it solid so you don't have to rely on the zip alone to hold it. I just zip the insulation and now you have me thinking about taping that for more support.
The mastic also really does lubricate it to make slipping it over the fitting easier and it holds it in place while zipping it tight.
|
Well good, then we helped each other out. Mastic it is. Good idea and a very sensible explanation 
__________________
Just slow, not stupid.
|
|
|
|
|
12-03-2008, 07:10 PM
|
#13
|
|
An old Tradesmen
Join Date: Oct 2008
Location: Lanc PA
Posts: 3,691
|
Technically, all joints are supposed to be sealed with mastic compound or mastic tape.
|
|
|
|
|
12-03-2008, 07:17 PM
|
#14
|
|
Member
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 2,422
|
Hey, there's that echo again 
__________________
Just slow, not stupid.
|
|
|
|
|
12-03-2008, 09:31 PM
|
#15
|
|
Member
Join Date: Sep 2008
Posts: 209
|
|
|
|
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|
