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» ICC Bulletin Board » Code Chat » Plumbing, Mechanical and Fuel Gas Codes » Duct penetration of rated assembly membrane

   
Author Topic: Duct penetration of rated assembly membrane
olc
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Duct penetration of rated assembly - fire damper
Duct penetration of a ceiling membrane of a floor/ceiling or roof ceiling assembly - radiation damper
What about the penetration of the floor of a floor/ceiling assembly - how do I protect this?

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FOREST
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Maybe section 607.6 if the IMC 2006 if that is your code of choice.
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olc
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I'm not seeing how that section addresses this specific scenerio.
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Builder bob
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The membranee being penetrated has to be protected....I.e. lower side of roof ceiling assembly.....
The top section of the floor/ceiling assembly should be fire stopped around the metallic Ductwork.

This is in line with IMC 607.6-
607.6.2 Membrane penetrations. Ducts and air transfer
openings constructed of approved materials, in accordance
with Section 603, that penetrate the ceiling membrane of a
fire-resistance-rated floor/ceiling or roof/ceiling assembly
shall be protected with one of the following:
1. A shaft enclosure in accordance with Sections 707 of
the International Building Code.
2. A listed ceiling radiation damper installed at the ceiling
line where a duct penetrates the ceiling of a
fire-resistance-rated floor/ceiling or roof/ceiling
assembly.
3. A listed ceiling radiation damper installed at the ceiling
line where a diffuser with no duct attached penetrates
the ceiling of a fire-resistance-rated
floor/ceiling or roof/ceiling assembly.
607.6.2.1 Ceiling radiation dampers. Ceiling radiation
dampers shall be tested in accordance with UL 555C and
installed in accordance with the manufacturer’s installation
instructions and listing. Ceiling radiation dampers
are not required where either of the following apply:
1. Tests in accordance withASTME119 have shown
that ceiling radiation dampers are not necessary in
order to maintain the fire-resistance rating of the
assembly.
2. Where exhaust duct penetrations are protected in
accordance with Section 712.4.2 of the International
Building Code and the exhaust ducts are
located within the cavity of a wall, and do not pass
through another dwelling unit or tenant space.

--------------------
Can you build to minimum standards? FWIW - MCP, CBO, CPE, CI, CFPE, ASCET
**********************************
**
www.notanicodesfan.org

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ken12000
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If the duct penetrates both the ceiling and the floor of the single assembly, then Fire Dampers (UL555) may be used if the damper is approved for installation in the floor type (i.e, wood, metal, or concrete)

If the duct only penetrates one portion or the other (either the ceiling or floor) but does not pass all the way through then a UL555C damper would be installed as approved by the specific assembly.

For example, an L528 floor/ceiling assembly is not allowed/approved to have any ductwork penetrations of a membrane and install a UL555C type damper. However, an L521 does have several approved ceiling dampers approved for use in that assembly.

--------------------
Kenneth Locke, CBO
Chief Mechanical Inspector
City of Tallahassee, FL

Posts: 143 | From: Tallahassee, FL | Registered: Jan 2008  |  IP: Logged
   

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