According to nfpa 13 draft curtains need to be 2 feet deep but the ibc code commentary refers to 18.
Nfpa 13 draft curtain.
Icc ac 77 listed for elevator door smoke containment to remove the need to pressurize the hoistway or have lobby doors on hold open.
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Curtains also rate glass up to two hours and are used in lieu of static glass draft curtains per nfpa 13.
5 17 3 draft curtain areas shall be around each roof ceiling fire suppression system and subdivided such that a single draft curtain area shall not exceed 697 m2 7500 ft2.
The maximum projected floor area under an individual sprinkler system shall be in accordance with chapters 6 and 7.
Draft curtains are also required by nfpa 13 in buildings where an early suppression fast response esfr is adjacent to standard response systems.
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It references nfpa 204 2015 standard for smoke and heat venting for additional information.
20 6 6 6 3 20 6 5 3 3 a clear aisle of at least 4 ft 1 2 m centered below the draft curtain shall.
Nfpa 13 requires closely spaced sprinklers with a draft curtain around unenclosed moving stairways staircases or similar unenclosed floor openings which are not large 20 feet or more across and 1000 sqft or greater as an alternative to the enclosure of the vertical opening nfpa 13 8 15 4 1 in 2016 and 9 3 5 1 in 2019.