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Old 05-16-2007, 09:46 PM   #1
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Cutting Duct


Was wondering what the best way of cutting ductwork. I need to cut a 6" diameter hole on top of my heat supply main to add one 6" offtake. I have looked at buying different types of snips but unsure what does the best job.

Is right cut mean just cuts right or does it also mean you need to use it in a certain hand? ...was thinking left hand would be logical and easier to cut right.

I came across this cutting tool today and was wondering if anyone has experience with it. One condition is I only have 8" of clearance between the duct top and subfloor.
The tool is: Klein Tools Nibbler Cutting Tool
http://www.acehardware.com/product/i...Id=21109859481

Not sure what the length of this tool is.

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Old 05-17-2007, 07:44 PM   #2
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Cutting Duct


Never seen or used that tool. But the best way to cut a small hole in the top of a duct that is installed is to do it through a large hole in the bottom of the duct. just patch the duct work when done.......trust me it may sound like a assinnine answer, but its the easiest way to do it, cut out the bottom of the duct reach up through and make your round hole then patch the bottom of the duct.If any one has a better idea i am all ears...........

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Old 05-18-2007, 10:05 AM   #3
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Cutting Duct


People may oppose this but I am going to mention anyway:

if you have enough space to put an angle grinder into the 8" space you mentioned. You can use angle grinder to do the cuting with metal cutting blade (I used multipurpose blade before)... in term of effort... the angle grinder does all the hard work for you... in term of scary... this is the most scary method as a lot of fire work will come out when cutting... I did mine that way... and still alive and no burning house etc... the firework come out is not enough to burn anything... but you should wear eye mask and best is those wildering machine mask...

also in Canada, the hole we cut is rectangular... don't know why... but most HD duck pipes we sell here have rectangular opening converting to circular, and that make the cut even easier with angle grinder... Also, the metal wound from angle grinder is the most prettiest compare to other type of device cutting
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Old 05-18-2007, 03:57 PM   #4
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Cutting Duct


Quote:
Originally Posted by KUI****G View Post
Also, the metal wound from angle grinder is the most prettiest compare to other type of device cutting
I'd be wounded too if I cut duct with an angle grinder
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Old 05-18-2007, 10:57 PM   #5
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Cutting Duct


Malco makes an awesome circular hole cutter. It can be adjusted to cut different diameters of holes. It attaches to a regular power drill. They also make an angle attachment which makes it great for spaces like your talking about. I've seen the cutters at Ace Hardware and home depot. They are a bit pricey, so you may want to check with a HVAC supply store to see if they can rent one to you. Good luck.



www.malcoproducts.com
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Old 05-18-2007, 11:01 PM   #6
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Cutting Duct


You can use a jig saw.
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Old 05-19-2007, 09:39 AM   #7
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Cutting Duct


Quote:
Originally Posted by Rookietinner View Post
Malco makes an awesome circular hole cutter. It can be adjusted to cut different diameters of holes. It attaches to a regular power drill. They also make an angle attachment which makes it great for spaces like your talking about. I've seen the cutters at Ace Hardware and home depot. They are a bit pricey, so you may want to check with a HVAC supply store to see if they can rent one to you. Good luck.



www.malcoproducts.com

These would work perfectly, except the price is very high for me when I only would need them to cut one 6" diameter hole. I would probably buy one if it also cut holes into wood, but seems it is only for sheetmetal applications.

Thanks for the info anyway!
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Old 05-19-2007, 09:41 AM   #8
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Cutting Duct


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Originally Posted by handy man88 View Post
You can use a jig saw.
A jig saw on sheet metal duct? Seems like the up and down action would cause problems....and I would never be able to fit one in the tight space.

Thanks anyway for the idea
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Old 05-19-2007, 02:59 PM   #9
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Cutting Duct


With only 8 inches of clearance, I would use a hole cutter. If you try to use snips, you will find that you must hold the tool upright to the cutting area for it to work well and you still must be able to see how well you are cutting. You may have looked at an expensive hole cutter. Look around for a cheaper model.
I don't know what you call expensive but I have tools that I only used once since I bought them and if I tried to use anything but the right tool, I would have butchered the job.
Another option would be a "hole saw". I have one that will cut a 6 inch hole. You will probally need an angle adapter for your drill.
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Old 01-23-2011, 01:04 AM   #10
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Cutting Duct


you can also use a dremel tool, works in small/tight spaces,and works well and is versatile.
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Old 01-23-2011, 01:30 AM   #11
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Cutting Duct


Jesus this thread is hilarious!

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