Glossary
64 VM-1 Smoke Management Application Guide
nondedicated system: A smoke control system that
shares components with other air moving
equipment. When the smoke control mode is
activated, the operating of the building's air moving
equipment changes in order to accomplish the
objectives of the smoke control design.
pressurized stairwell: A type of smoke control system in
which stair shafts are mechanically pressurized with
outdoor air to keep smoke from contaminating them
during a fire event.
SCS: Acronym for smoke control system. See also
smoke control system.
separated spaces: Spaces within a building that are
isolated from large-volume spaces by smoke
barriers that do not rely on airflow to restrict the
movement of smoke.
smoke: The airborne solid and liquid particulates and
gases evolved when a material undergoes pyrolysis
or combustion, together with the quantity of air that
is entrained or otherwise mixed into the mass.
smoke barrier: A 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.
smoke control mode: A predefined operational
configuration of a system, zone, or device for the
purpose of smoke control.
smoke control system: An engineered system that uses
mechanical fans to produce airflow and pressure
differences across smoke barriers to limit and direct
smoke movement.
smoke damper: A UL Listed device designed to resist
the passage of air or smoke. Smoke dampers are
installed in ducts or smoke barriers separating floor
or smoke zones. A fire barrier constructed to limit
smoke may also serve as a smoke barrier and may
use a combination fire and smoke damper that is
also UL Listed. Systems serving more than one floor
with a capacity greater than 15,000 cfm are required
by NFPA 90A to have smoke dampers installed to
isolate the air handling equipment, including filters,
to restrict the circulation of smoke.
smoke exhaust system: A mechanical or gravity system
intended to move smoke from a smoke zone to the
exterior of a building, including smoke removal,
purging, and venting systems, as well as the
function of exhaust fans utilized to reduce the
pressure in a smoke zone.
smoke proof enclosure: A continuous stairway which is
enclosed from top to bottom by a 2-hour firewall and
exits to the exterior of a building. Entry into the
stairway must be through vestibules or outside
balconies on each floor. The design must limit
smoke entry and include ventilation which is natural
or mechanical.
smoke zone: The smoke control zone in which the fire is
located.
stack effect: The vertical airflow within buildings caused
by the temperature-created density differences
between the building interior and exterior or between
two interior spaces.
tenable environment: An environment in which smoke
and heat is limited or otherwise restricted in order to
maintain the impact on occupants to a level that is
not life threatening. In a zoned smoke control
system, pressure differences are used to maintain a
tenable environment in an area intended to protect
building occupants while evacuation is taking place.
UBC: Acronym for uniform building code.
UUKL: The Underwriters Laboratories (UL)
complementary product category designation for
smoke control system equipment.
VAV: Acronym for variable air volume.
zoned smoke control: A smoke control system that
includes smoke exhaust for the smoke zone and
pressurization for all contiguous smoke control
zones. The remaining smoke control zones in the
building also may be pressurized.
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