Originally Posted By: ddurrant
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Can a flex hvac duct run through the garage firewall? I haven’t see this before today.
Can a flex hvac duct run through the garage firewall? I haven’t see this before today.
Originally Posted By: rcloyd
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Don:
A flex duct should never run through a wall, floor or ceiling fire-rated or not.
Regards,
--
Russell G. Cloyd
Intra-Spec Home Inspections
& Code Consulting, LLC
859-586-4591
www.intra-spechomeinspections.com
Originally Posted By: Ryan Jackson
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As long as it is 26 gauge and has no openenings into the garage it is fine.
–
Ryan Jackson, Salt Lake City
Originally Posted By: rcloyd
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Ryan:
I've never seen a 26 gage flex duct. Who makes that?
--
Russell G. Cloyd
Intra-Spec Home Inspections
& Code Consulting, LLC
859-586-4591
www.intra-spechomeinspections.com
Originally Posted By: jpeck
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Russell,
I think Ryan was thinking of metal duct, not flex duct.
You are correct. Flex duct is not allowed to be run through a ceiling, floor or a wall. It needs to be transitioned to rigid (like duct board) then back to flex duct.
--
Jerry Peck
South Florida
Originally Posted By: Bob Badger
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Jerry nice to see you back
, it’s been about 3 weeks.Bob
--
Bob (AKA iwire)
ECN Discussion Forums
Mike Holt Code Forum
Originally Posted By: jpeck
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Hi Bob,
Yeah, I only took 10 days off, but that turned into another 10 days getting caught back up.
Glad to be back. Missed you guys (and gals).
--
Jerry Peck
South Florida
Originally Posted By: srowe
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Please post code references? FBC or International.
For my own knowledge not for report writing...THANKS!!
Originally Posted By: jpeck
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Here are the Air Diffusion Council installation instructions.
But you really should have the book.
When you get the book, go to page 20, Section 6, 6.2
d. When installed in a fire-rated floor / roof ceiling assembly, ducts shall conform with the design of the tested fire-resistive assembly.
g. Should not penetrate walls where fire dampers are required
And everyone knows that all concealed spaces are to be closed off for draft stopping and fire blocking purposes, such as at floors, ceilings, walls, top plates, bottom plates, etc.
So I guess a flexible duct going through a wall would be debatable as someone could argue that IF you could seal around the flexible duct (and not have the flexible fall away from the sealant), you could penetrate through the wall. However, the other side would argue that flexible duct, being flexible, will eventually fall away from the cut opening, leaving a non-sealed opening between the duct and the cut opening's edge.
From the Florida Building Code.
M603.5.5 Penetrations prohibited. Flexible air ducts and flexible air connectors shall not pass through any fire-resistance-rated assembly. Flexible air connectors shall not pass through any wall, floor or ceiling.
--
Jerry Peck
South Florida
Originally Posted By: ddurrant
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Thanks to everybody that offered information- it has been very helpful-Don