Cutting into existing ductwork


Old 11-25-02, 11:55 AM
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Question Cutting into existing ductwork

I am in the process of finishing my basement. I want to add afew heat vents and cold air returns. I have all of the new materials on hand. My question is cutting the necessary 6" circles out of the existing ductwork.
I can use my tin snips to do this but would prefer to find a tool that make these cutouts. I would rather the cutout be uniform and without burrs.

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Old 11-25-02, 11:58 AM
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I just re-read my thread and it did not seem clear even to me.

I am wondering if there is a tool that will make 6" circular cutouts in my existing sheet metal ducts.

Thanks for any help...

that was not so hard - now was it?????
Old 11-25-02, 12:34 PM
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hole cutter

mine is made by malco. it goes on the drill and is adjustable up to 14 inches. it has a milling bit that actually cuts a perfect hole.
Old 11-25-02, 12:40 PM
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This is for a round take off I think. You take and draw your circle on the duct, slice a cut in the circle with a screw driver and hammer just short of the line .Now with a left or right hand aviation snips you can cut a very smooth hole in the duct.Malco makes a hole cuter for from 2" to 12" lot of $$$$$$ for it. We dont use them in the trade here. ED
Old 11-25-02, 12:44 PM
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Thanks hvac and Ed. I checked out the Malco site and they do not list local distributors so I will try Eds idea first and go from there.

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