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Need help w/HVAC flexible duct replacement
Posted on 3/1/26 at 5:35 pm
Posted on 3/1/26 at 5:35 pm
30+ year old 2 story home. I’ve got flexible duct work that needs changing. The runs in the attic to the 2nd floor are straightforward and self explanatory. My question is do I just change the runs going to the first floor to where they penetrate and put a fitting to join the new ducting as close as possible to the penetration? I’m assuming the vertical drops can’t be changed without opening up interior walls? The duct work running across attic is in pretty bad shape so I’d like to change as much as possible
This post was edited on 3/2/26 at 8:20 am
2
Posted on 3/1/26 at 7:30 pm to SETH6180
You have one hvac system for 1st and second floor? Am I reading this correctly?
Posted on 3/1/26 at 7:40 pm to PaBon
2 seperate units, 1 for upstairs and 1 downstairs
This post was edited on 3/1/26 at 7:42 pm
Posted on 3/1/26 at 10:06 pm to SETH6180
Hard pipe with outside duct wrap is better than flex duct if practical.
Posted on 3/2/26 at 3:24 am to doubleb
Yes I understand that, it's not practical in this situation. My question is regarding the ducting penetrating and running down to first floor from attic. I don't see a way to change that without opening up walls.
This post was edited on 3/2/26 at 9:13 am
Posted on 3/2/26 at 6:51 pm to SETH6180
Bump
Posted on 3/4/26 at 5:42 pm to SETH6180
quote:
My question is regarding the ducting penetrating and running down to first floor from attic. I don't see a way to change that without opening up walls.
If you have two units, your first floor unit should be first floor and 2nd floor should be in the attic? Why is your 2nd floor unit going to the first floor? Are you sure about that?
Posted on 3/4/26 at 8:44 pm to baldona
quote:
your first floor unit should be first floor and 2nd floor should be in the attic
Not necessarily.
Posted on 3/5/26 at 6:21 am to Maniac979
quote:
Not necessarily
I agree but OP said that. He must have misspoke, which is fine
Posted on 3/5/26 at 7:01 am to baldona
To clarify, I've got 2 units in my attic. One services the 1st floor with duct work going from attic penetrating thru and terminating at first floor (this is the duct work I'm questioning how to change). The other services the 2nd story with duct work going directly to ceiling registers in second floor ceiling (this duct work is self-explanatory as it's only horizontal runs across attic).
My question is how I change the flexible ducting servicing the 1st floor registers, it's dropping down thru the walls in most spots.
My question is how I change the flexible ducting servicing the 1st floor registers, it's dropping down thru the walls in most spots.
Posted on 3/5/26 at 1:54 pm to SETH6180
Use a fish tape type of set up to pull the new duct to the register.
Posted on 3/5/26 at 2:33 pm to Jwils
I was thinking this but worried if I've got possible electrical or even an exposed screw/nail that would tear it. Also, would I be able to attach to the boot just by reaching inside the register.
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