UFC 3-600-01 (with change 6, 2021), Section 4-29.2.1 requires a manually activated smoke exhaust system for Limited-Access Structures three stories or more in height, with 6 air changes per hour throughout the entire building.
NFPA 101 (2024), Section 11.7.3.1.2 and 11.7.3.2 outlines that if there are no unobstructed operable openings, openable from both the exterior and interior of the building, the building is defined as a Limited-Access Structure. Most DoD buildings have security requirements that do not permit operable windows, especially not from the exterior or the interior. Therefore, most DoD structures over two stories in height would require these post-fire smoke purge systems; however, I have not seen them actually being implemented on projects. Is there an alternative code path I am missing, or have you designed and installed these systems in UFC projects? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
6 Comments
Glenn Berger
11/21/2024 08:23:47 am
Recently been involved with several facilities that require this system.
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Greg
11/21/2024 09:08:28 am
Good news, most DoD locations have a fire department and chief who is likely has a sensible voice in this matter, as the installation is clearly 'post-fire event'.
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Greg
11/21/2024 09:32:16 am
I forgot to mention that the PPV can be used to pressurize one stairwell and open floor level doors to blow across and exhaust through the other stairwell with an open smoke-heat vent.
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Jack G
11/21/2024 01:26:06 pm
I like Greg s idea.
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Brian Gerdwagen
11/22/2024 01:51:39 am
Limited Access does not mean "no operable windows." It means "windowless." There are not many buildings that are windowless, even on DoD facilities.
Reply
Greg
11/22/2024 08:14:56 am
Hi Brian,
Reply
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