Product Technical Guides : US-EN Firestop Systems Guide For Specifiers | Page 692

Membrane Penetration Firestop A material, device or construction
installed to resist, for a prescribed period of time when tested in
accordance with appropriate test standard. The passage of flame
and heat through openings in a protective membrane in order to
accommodate cables, cable trays, conduit, tubing, pipes or similar
items.
Non-combustible A material that, in the form in which it is used and
under the conditions anticipated, will not aid combustion or add
appreciable heat to an ambient fire.
Non-Rated System An assembly that has not been tested, or
assigned an hourly rating in accordance with ASTM E-119.
Passive Fire Protection A device or system designed to confine fire
and smoke in zones (e.g. compartmentalization).
Penetrant (Penetrating Item) Any item passing completely though a
wall or floor, such as pipes, conduits, cables, etc.
Percent Fill The cross-sectional area of an opening that is occupied
by a penetrating item(s). Typically found in UL Systems containing
cables. Percent fill may be calculated with the following formulas:
Percent Fill (% f ) = (A w /A o ) x 100
N = number of wires
Area of Wire (A w ) = [3.14 x (r c 2 )] x N
r c = radius of wire
Area of Opening (A o ) = 3.14 x (r o 2 ) r o = radius of opening
Point of Contact (Penetrating Item) When listed UL system
drawing allows penetrating item to “touch” edge of opening.
Shop Drawings Construction drawings generated by contractors,
sub-contractors, or suppliers to communicate what they plan to
furnish on a project to meet the terms of their contract. They differ
from the contract drawings in that contract drawings are generated
by the design firm and provided to the contractors and suppliers.
Shop drawings are often marked-up contract drawings, but the
supplier or contractor can also generate them from scratch. Shop
drawings are part of the submittals, which are prepared so that
the contractor can gain approval to proceed. They are reviewed
and approved by the appropriate design professional. Areas where
shop drawings are used include structural steel, miscellaneous
metals, pre-cast concrete, and in some cases firestop
Smoke Barrier A continuous membrane, either vertical or horizontal,
such as a wall, floor, or ceiling assembly, that is designed and
constructed to restrict the movement of smoke. A smoke barrier
might or might not have a fire resistance rating. Such barriers
might have protected openings.
Smoke Compartment A space within a building enclosed by smoke
barriers on all sides, including the top and bottom.
Smoke Damper A listed device installed in ducts and air transfer
openings that is designed to resist the passage of air and smoke.
The device is installed to operate automatically, controlled by a
smoke detection system, and where required is capable of being
positioned manually from a remote command station.
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T Rating The time for the temperature of the unexposed surface of
the firestop system or any penetrating item to rise 325°F above its
initial temperature as determined by ASTM E-814 and UL 1479.
Through Penetration Penetrating items passing entirely through
both protective membranes of bearing walls required to have a fire-
resistance rating and wall requiring protected openings.
Type I Construction Construction in which the structural members
are noncombustible (formerly referred to as fire resistive).
Type II Construction Construction in which the structural elements
are entirely of noncombustible or limited combustible materials
permitted by the code and protected to have some degree of fire
resistance (formerly referred to as noncombustible).
Type III Construction Construction which all or part of the interior
structural elements may be of combustible materials or any other
material permitted by the particular building code being applied
(formerly referred to as exterior protected combustible or ordinary
construction).
Type IV Construction Construction in which structural members
i.e. columns, beams, arches, floors, and roofs, are basically of
unprotected wood (solid or laminated) with large cross-sectional
areas (formerly referred to as heavy timber).
Type V Construction Construction which the structural members
are entirely of wood or any other material permitted by the code
being applied (formerly referred to as wood frame).
UL UL is an abbreviation for Underwriters Laboratories Inc., a not for
profit independent organization testing for public safety.
UL 1479 “Fire Tests of Through-Penetration Firestops” (equivalent to
ASTM E-814).
UL 2079 “Tests for Fire Resistance of Building Joint Systems.”
UL Fire Resistance Directory UL publication which contains
descriptions and ratings of firestop systems.
Vented (Open) Piping System Piping system which is
atmospherically vented by design to prevent backflow or vacuum.
Examples: DWV piping (drain, waste or vent).
W-rating An optional rating for through penetrations Firestop
systems. Determines the effectiveness of a firestop system to
restrict the flow of water. Class 1-rated firestops have been shown
to resist up to 3 feet of water column for 72 hours.