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Group I-2 and I-3 occupancies in accordance with Sections 407.5
and 408.6
As part of a smoke control system per Section 909.5
An accessible means of egress and accessible area of refuge per
Sections 1009.6 and 1009.6.4
To compartment underground buildings or protect the elevator
lobbies within them per Sections 405.4.2 and 405.4.3.
For the protection of elevator lobbies per Sections 3007.6.2 and
3008.6.2
The L rating of a tested assembly is verified at both the ambient
temperature and at elevated temperatures to ensure that the product
can perform its intended function at a broad range of temperatures.
Conducting the leakage test at both temperatures helps eliminate
products that are effective at one end of the temperature range but
lack the characteristics needed to stop the spread of smoke when
exposed to the different situations that may be encountered. Code
users should also realize that the air leakage test is an optional
test within the UL 2079 standard. Therefore, not all assemblies that
indicate they were tested in accordance with UL 2079 will have
been tested to establish an L rating. As a base test standard, the
UL 2079 standard is similar to the ASTM E 1966 standard in the
fact that it is accepted by Section 715.3 for determining the fire-
resistance capabilities of a joint system, but, the smoke barrier air
leakage requirements of Section 715.6 can be verified only by the
additional, optional leakage test.
One of the most overlooked persons while providing compliant joint
systems is the structural engineer. Since joints must be capable
of accommodating the movement of buildings and independent
assemblies while still performing as intended, it is important to
know exactly how much movement is anticipated between adjacent
assemblies.