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i8kermit 07-25-2008 11:49 AM

Remove and replace single duct span
I am doing some structural work in my basement and the only way to get in the steel is to take down a span of ductwork, or to cut it. It looks like I can take out the piece I need to, it's about 3 feet long, on one end is an elbow that turns it upstairs through the floor, and the other end it joins a larger network that comes from the furnace.
I'm not afraid of home repairs, but am a novice when it comes to hvac. Is this something I should be able to swing on my own? If so, how do I go about removing the bands that connect the pieces, removing the piece I need to get out of the way, and later reconnecting it?

8 Ball 07-26-2008 06:52 AM

On the narrower side of the duct are metal strips called drives. They are slid in place on metal "tracks" on eighther side of the duct,then the ends are folded over.

Take a screwdriver, and bend up both ends. grab the end with a pair of pliers, and pull or pound the drive off.

Support the duct before you pull them all off. Metal edges are sharp, be careful.

The longer metal strips that are on the duct are called "S" locks, which align and seal the two pieces of duct.

If you damage any of them, measure and purchase new ones.

Have fun! have a great excuse to purchase a tool...a DUCT STRETCHER...honest thats what its called. Gives you great control of the duct when installing, or removing.

i8kermit 07-26-2008 10:07 PM

Awesome, thanks. I can't wait to try it tomorrow. I'll let u know how it goes.

i8kermit 07-31-2008 01:31 PM

Well, I got the duct off allright. The drives really didn't wanna move, they've been there a good 40 years or so, and the duct was bolted to the one next to it, so that one had to go to, but otherwise it went well. We'll see how reattaching goes.
Thanks again.

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