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Viessmann Vitodens venting specs for fire wall

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GW
GW Member Posts: 4,693
Brad,

I'm wanting to pass througha two-hour ceiling. It's hard to explain the exact situation. I'll see if I can get the PE to go along with it. Thanks, GW
Gary Wilson
Wilson Services, Inc
Northampton, MA
gary@wilsonph.com

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  • GW
    GW Member Posts: 4,693
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    gotta pass through a two-hour

    does anyone know where in the specs it specs out the metal/material for the vent piping? I need to dot I's and cross T's... new construction commercial job.

    Thanks, Gary
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com
  • Brad White
    Brad White Member Posts: 2,398
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    NFPA-90A

    allows steel sheetmetal to account for a one-hour rating by default although not explicitly. The reason is that a one-hour partition can have a continuously duct pass through it without a fire damper. A transfer duct would have a damper. 1.5 hour ratings and up you need a damper. Not applicable to your venting situation, just some background.

    I would enclose it after testing in a continuous 2-hour enclosure, essentially extending the partition rating along the vent system. You could also use Pabco or Fyre-Wrap (which everyone says is expensive but nobody tells you the price :)

    We used Fyre-Wrap on a smoke control system to protect the fan and dampers as it passed from the enclosure to the outside.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
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