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Old 01-15-2009, 11:23 AM   #1
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Need to add 10" duct to plenum. Looking for DIY.


Looking for step by step DIY. Will this work?
Draw circle on plenum.
Cut with circle cutting tin snips.
Attach 10" connector thing with some sheet metal screws.
Coat the connector area with some sort of mastic.
Attach duct with tywrap.
Apply duct tape.
Any advise or opinions much apperciated.

Jeff

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Old 01-15-2009, 12:21 PM   #2
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Need to add 10" duct to plenum. Looking for DIY.


When attaching 10" short collar to existing plenum, does every other tab on the collar get bent to screw to the outside of the plenum? Do the remaining tabs stay straight and go inside the plenum?

I have one bedroom that has a 9" duct and a 10x10x9 square to round. I need more volume going to this room. I want to increase duct size to 10" (approx 10 feet long) then install 8x8x10 wye and 2 new rectangular registars (6x14x8?).

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Old 01-15-2009, 12:28 PM   #3
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Need to add 10" duct to plenum. Looking for DIY.


You wanna bend every one of the tabs back. You really don't even need to screw them. It'll be pretty tight once the tabs are all bent back. Screws won't really hurt though.

Make srue to use aluminum tape not "duct" tape, the fiberglass reinforced crap. You can substitute mastic for the tape if you want.

Wear gloves when doing this work, your hands will thank you.

The increase to 10" actually yeilds a 23% increase in area. Additional registers will help too. Wether it helps enough to solve your (perceived) problem, no one can tell. You'll just have to see I guess. If you can go bigger then 10", it won't hurt.

You may also be able to acheive additional airflow by reducing airflow to other registers.
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Old 01-15-2009, 01:00 PM   #4
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Need to add 10" duct to plenum. Looking for DIY.


O.K. I'll bend all the tabs. Half inside and half outside.
I was just looking at mastic at:
http://www.rcdmastics.com/
Can you tell me the difference between say #6 and #8?
The existing ductwork has grey mastic applied. Does grey mean it's #8?

When I remodeled the house this ductwork was speced for the master bedroom. At the time I did not want it done because all four of us were living in that room. Now it's time to finish and times being what they are I am trying to DIY.

Thanks for your help.
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Old 01-15-2009, 02:00 PM   #5
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Need to add 10" duct to plenum. Looking for DIY.


Quote:
Originally Posted by 01sport View Post
O.K. I'll bend all the tabs. Half inside and half outside.
All of em inside.
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