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The time now is Oct 16, 2008 - 01:41 AM

The Sheet Metal Shop .Com Forum Index » Sheet Metal Forums » Duct Construction and Uses


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Nick67
Post subject:Plenum and takeoffs PostPosted: Aug 04, 2008 - 04:30 PM #7748



Joined: Aug 04, 2008
Posts: 2
I am installing a new furnace and plenum. The main trunk line and old plenum/furnace are 24" wide. The new furnace is 21" wide. The question is should I reduce the main trunk from 24" to 21" and tie it into the new 21" plenum or should I make the new plenum 24" wide and reduce it down to fit the 21" furnace? Thanks.
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bordontn2
Post subject:RE: Plenum and takeoffs PostPosted: Aug 05, 2008 - 01:22 PM #7749
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Joined: Nov 01, 2006
Posts: 95
Location: McEwen,Tn.
Nick67........why change anymore than you have to????????Transition from 24" down to 21" Leave as much of the existing duct as possible....
bordontn2

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tinbanger
Post subject:RE: Plenum and takeoffs PostPosted: Aug 05, 2008 - 03:15 PM #7751



Joined: Mar 21, 2008
Posts: 6
Location: Echo Bay
I agree! You'll save a lot of time and money!
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Nick67
Post subject:RE: Plenum and takeoffs PostPosted: Aug 05, 2008 - 07:47 PM #7752



Joined: Aug 04, 2008
Posts: 2
Thanks for the advise.
I didn't know if the smaller transition off the plenum into the larger trunk line would screw up the air flow.
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