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Duct Smoke in Supply for Stair Pressurization?

6/4/2021

2 Comments

 
For a smoke control stair pressurization system designed in accordance with IBC 909 and IMC 513, does the code require a duct smoke detector on the supply fan?

Does the installation of a smoke damper at the stairway boundary factor into this requirement? (i.e. IBC 717.3.3.2 requires a detector within 5 feet of a smoke damper). Normally this motorized smoke damper is closed and then automatically opens upon activation of a specific fire alarm signal.

NFPA 92 6.4.6.2 does require a duct detector on the stair pressurization supply fan; however, I'm unaware of a similar requirement in IBC/IMC. NFPA's intent is to detect smoke on the air supply and shut down the unit before smoke compromises the stairway.

For elevator hoistways that require smoke control, IBC 909.21.4.2 states to provide a detector. I would have expected a general statement in IBC 909.12 with the same intention as NFPA 92; however, I do not see a similar requirement in the IBC/IMC for stairways.

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2 Comments
Todd Wyatt
6/4/2021 09:30:44 am

NFPA 92 (2018) is referenced by the 2021 IBC (https://codes.iccsafe.org/content/IBC2021P1/chapter-9-fire-protection-and-life-safety-systems) in 909.7 Airflow Design method and 909.8 Exhaust Method but is otherwise not referenced. Unless the jurisdiction (e.g. Building Official and/or Fire Marshal) has adopted the NFPA 92 by reference and/or other Codes (e.g. NFPA 101) that references the NFPA 92, this NFPA 92 requirement is not required.

Reply
Paul
6/4/2021 09:43:09 am

It is normally understood from IBC (2018 Edition), Section 909.21.4.2 that any smoke in the system shall shutdown the fan of the system.

This has been construed as a duct detector in the ductwork and differently among jurisdictions with some wanting the detector located after the fan to sense the fan burning up and others wanting it on the intake side only which is in agreement with the ICC commentary stating it should be on the intake side.

As far as other dampers and activation or closure, refer to the Rational Analysis which should list any sequencing requirements taken into the designs consideration.

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  • Blog
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  • THE TOOLKIT
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
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    • DOMESTIC DEMAND*
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    • FIRE PUMP DATABASE*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER*
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    • K-FACTOR SELECTOR*
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'22)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
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    • SYSTEM ESTIMATOR*
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