Name that duct work


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Old 08-04-15, 07:09 PM
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Name that duct work

I will soon be hooking up four new flexible duct lines, already roughed in. I'll be connecting them to hard ducting.

I have two take-offs with adjustable dampers that are preformed at the flange to fit hard duct. I need to know what the things are called before I can hunt for the ones I need.

Here's a pic. It'll type a thousand words.

Name:  duct take-off.jpg
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  #2  
Old 08-04-15, 07:22 PM
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90° saddle take off w/ damper. I'm assuming it's 8"?
 
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Old 08-04-15, 08:47 PM
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It probably is an 8". The system starts at 12" and tapers down. I think these are left over from the last addition job which fed from the very end of the main trunk. I'll be needing 12" and maybe the 8's that I have left. Now I know what to search/ask for.
Thanks for the language lessons.
 
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Old 08-04-15, 08:50 PM
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While we're at it. What hole saw do I need, or is it too expensive for only four holes?
 
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Old 08-04-15, 08:56 PM
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You don't want to use a hole saw. You'll shred the duct and your hand.

You'll need to use tin snips. You drill a starter hole and then use the snips to cut the circle.
Here's a helpful video...... you tube /watch?v=8QsiOppAU1s
 
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Old 08-04-15, 09:02 PM
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And you will probably want the offset snips with the red handle for straight and left hand turns... they work best for circles. The offset helps keep your hand out of the way of the sharp edges.
 
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Old 08-04-15, 09:08 PM
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He's cutting square duct but I could get some cool snip like that and do the same on my round duct. All the holes will be in place that are easy to work on.

One of the bubbas that installed the system mentioned hole saws he had that I could borrow. I don't want him or his buddies near the system anymore after the stuff I found while roughing in my new ducting. I'm not an HVAC guy and redid their connections better than they installed them.
 
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Old 08-04-15, 09:19 PM
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A hole saw has jagged teeth that will get caught on the ductwork and literally tear it up.
It's a little more difficult cutting a round hole in a round duct but the idea is the same.

Just wear gloves.... fresh cut sheet metal is identical to a razor blade..... trust me.
 
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Old 08-06-15, 01:32 PM
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easy peasy mac and cheesy! a 1inch unibit works well for a starter hole. Just make sure you get the one that steps from 0-1inch (can start its own hole). a good pair of offset snips like Wise will be well worth the investment. I have made a few dollars here and there by using them.
 
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Old 08-07-15, 05:29 AM
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I just put a little money into a set of three snips, red, green, and yellow. They could come in handy doing siding and such too.

Good idea about the unibit. I've been meaning to get one for a while now anyway.

PJmax. I have scars enough to keep gloves on for lots of jobs. You are wise from the years of abuse.
 
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Old 08-07-15, 05:31 AM
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Hope you caught the advice about getting the "offset" ones... they are different than the standard snips.
 
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Old 08-09-15, 07:10 AM
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Why yes. Yes I did. Catch the bit about the colored handles?
 
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Old 08-09-15, 07:15 AM
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Don't be a dick. Some are offset more than others and are really nice to use.

I was thinking of something like these, which are offset a lot more than the standard set of 3 that is sold.

https://jet.com/product/a400c5112e76...FQiNaQodyR8IKw

Red & green handles don't automatically mean they are offset.
 
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Old 08-10-15, 03:22 AM
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Dude. Not trying to be a d***. I get it. Offset. You said it twice now. I followed your instructions. The snips are offset. Thanks for your help.
 
 

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