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UL 1479 Document Information:
Title
UL Standard for Safety Fire Tests of Through-Penetration Firestops
Underwriters Laboratories Inc.
Publication Date:
May 23, 2003
Scope:
These requirements cover through-penetration firestops of
various materials and construction that are intended for use in
openings in fire resistive wall or floor-ceiling assemblies, or
both.
The method of testing through-penetration firestops as specified
by these requirements consists of exposure of test samples to a
fire of standard time and temperature and to an application of a
hose stream. Ratings are then established on the basis of:
The length of time the firestop resists fire before the first
development of through openings or flaming on the unexposed
surface,
Acceptable limitation of thermal transmission, and
Acceptable performance under the application of the hose
stream.
The method of testing also includes optional air leakage tests
to determine the rate of air leakage through through-penetration
firestop systems resulting from a specified air pressure difference
applied across the surface of the systems.
The method of testing also includes optional water leakage tests
to determine the ability of through-penetration firestop systems to
resist the passage of water under a three foot pressure head. This
method does not evaluate the ability of uncured firestop systems to
resist such exposure.
Two ratings are established for each through-penetration
firestop system: an F rating based upon flame occurrence on the
unexposed side of the test sample and acceptable hose stream
performance; and a T rating based on temperature rise and flame
occurrence on the unexposed side of the test sample and acceptable
hose stream performance.
An L rating may also be established for a through-penetration
firestop system. The L rating is based on the amount of air leakage
through the test sample.
An W rating may also be established for a through-penetration
firestop system. The W rating is based on the water resistance of
the test sample.
The method of testing through-penetration firestop systems
containing piping systems for vented (drain, waste or vent) systems
and closed (process or supply) systems is differentiated by the
capping or non-capping of the piping systems on the unexposed side
of the test assembly as described in 4.1.2.
Tests conducted in accordance with these requirements are
intended to demonstrate the performance of through-penetration
firestops during exposure to fire, but are not intended to
determine acceptability of firestops for use after exposure to
fire. These requirements do not cover the ampacity of conductors
encased in through-penetration firestop materials.
The results obtained from the air leakage tests are expressed in
cubic feet per minute (cubic meter per second) per square foot
(square meter) of opening. The results are intended to develop data
to assist authorities having jurisdiction, and others, in
determining the acceptability of through-penetration firestops with
reference to the control of air movement through the assembly.
These requirements do not cover devices that penetrate fire
resistive floors and walls but terminate on the opposite side, as,
for example, an outlet box and fitting.
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