ACCESSIBLE . A continuous
and unobstructed way of egress travel from any accessible
point in a building or facility to a public way.
AISLE. An exit access component that defines and provides
a path of egress travel.
AISLE ACCESSWAY. That
portion of an exit access that leads to an aisle.
ALTERNATING TREAD DEVICE.
A device that has a series of steps between 50 and 70 degrees
(0.87 and 1.22 rad) from horizontal, usually attached to
a center support rail in an alternating manner so that the
user does not have both feet on the same level at the same
time.
AREA
OF REFUGE. An area where persons unable to use stairways
can remain temporarily to await instructions or assistance
during emergency evacuation.
BLEACHERS. Tiered seating
facilities.
COMMON
PATH OF EGRESS TRAVEL. That portion of exit access
which the occupants are required to traverse before two
separate and distinct paths of egress travel to two exits
are available. Paths that merge are common paths of travel.
Common paths of egress travel shall be included within the
permitted travel distance.
CORRIDOR. An enclosed exit access component that defines
and provides a path of egress travel to an exit.
DOOR,
BALANCED. A door equipped with double-pivoted hardware
so designed as to cause a semi counterbalanced swing action
when opening.
EGRESS COURT. A court
or yard which provides access to a public way for one or
more exits.
EMERGENCY ESCAPE AND RESCUE
OPENING. An operable window, door or other similar device
that provides for a means of escape and access for rescue
in the event of an emergency.
EXIT. That portion of
a means of egress system which is separated from other
interior spaces of a building or structure by fire-resistance-rated
construction and opening protectives as required to provide
a protected path of egress travel between the exit access
and the exit discharge. Exits include exterior exit doors
at ground level, exit enclosures, exit passageways, exterior
exit stairs, exterior exit ramps and horizontal exits.
EXIT, HORIZONTAL. A
path of egress travel from one building to an area in another
building on approximately the same level, or a path of egress
travel through or around a wall or partition to an area
on approximately the same level in the same building, which
affords safety from fire and smoke from the area of incidence
and areas communicating therewith.
EXIT ACCESS. That portion
of a means of egress system that leads from any occupied
portion of a building or structure to an exit.
EXIT DISCHARGE. That
portion of a means of egress system between the termination
of an exit and a public way.
EXIT DISCHARGE, LEVEL OF.
The horizontal plane located at the point at which an exit
terminates and an exit discharge begins.
EXIT
ENCLOSURE. An exit component that is separated from
other interior spaces of a building or structure by fire-resistance-rated
construction and opening protectives, and provides for a
protected path of egress travel in a vertical or horizontal
direction to the exit discharge or the public way.
EXIT PASSAGEWAY. An
exit component that is separated from all other interior
spaces of a building or structure by fire-resistance-rated
construction and opening protectives, and provides for a
protected path of egress travel in a horizontal direction
to the exit discharge or the public way.
FIRE EXIT HARDWARE.
Panic hardware that is listed for use on fire door assemblies.
FLOOR AREA, GROSS. The
floor area within the inside perimeter of the exterior walls
of the building under consideration, exclusive of vent shafts
and courts, without deduction for corridors, stairways,
closets, the thickness of interior walls, columns or other
features. The floor area of a building, or portion thereof,
not provided with surrounding exterior walls shall be the
usable area under the horizontal projection of the roof
or floor above. The gross floor area shall not include shafts
with no openings or interior courts.
FLOOR AREA, NET. The
actual occupied area not including unoccupied accessory
areas such as corridors, stairways, toilet rooms, mechanical
rooms and closets.
FOLDING
AND TELESCOPIC SEATING. Tiered seating facilities having
an overall shape and size that are capable of being reduced
for purposes of moving or storing.
GRANDSTAND. Tiered seating
facilities.
GUARD.
A building component or a system of building components
located at or near the open sides of elevated walking surfaces
that minimizes the possibility of a fall from the walking
surface to a lower level.
HANDRAIL. A horizontal or sloping rail intended for
grasping by the hand for guidance or support. A continuous
and unobstructed path of vertical and horizontal egress
travel from any occupied portion of a building or structure
to a public way. A means of egress consists of three separate
and distinct parts: the exit access, the exit and the exit
discharge.
MERCHANDISE
PAD. A merchandise pad is an area for display of merchandise
surrounded by aisles, permanent fixtures or walls. Merchandise
pads contain elements such as nonfixed and moveable fixtures,
cases, racks, counters and partitions as indicated in Section
105.2 from which customers browse or shop.
NOSING. The leading edge of treads of stairs and of
landings at the top of stairway flights.
OCCUPANT LOAD. The number of persons for which the means
of egress of a building or portion thereof is designed.
PANIC
HARDWARE. A door-latching assembly incorporating a device
that releases the latch upon the application of a force
in the direction of egress travel.
PUBLIC
WAY. A street, alley or other parcel of land open to
the outside air leading to a street, that has been deeded,
dedicated or otherwise permanently appropriated to the
public for public use and which has a clear width and height
of not less than 10 feet (3048 mm).
RAMP. A walking surface that has a running slope steeper
than one unit vertical in 20 units horizontal (5-percent
slope).
SCISSOR STAIR. Two interlocking stairways providing
two separate paths of egress located within one stairwell
enclosure.
SMOKE-PROTECTED
ASSEMBLY SEATING. Seating served by means of egress
that is not subject to smoke accumulation within or under
a structure.
STAIR. A change in elevation, consisting of one or more
risers.
STAIRWAY. One or more
flights of stairs, either exterior or interior, with the
necessary landings and platforms connecting them, to form
a continuous and uninterrupted passage from one level to
another.
STAIRWAY,
EXTERIOR. A stairway that is open on at least one side,
except for required structural columns, beams, handrails
and guards. The adjoining open areas shall be either yards,
courts or public ways. The other sides of the exterior stairway
need not be open.
STAIRWAY, INTERIOR. A stairway not meeting the definition
of an exterior stairway.
STAIRWAY, SPIRAL. A stairway having a closed circular
form in its plan view with uniform section-shaped treads
attached to and radiating from a minimum -diameter supporting
column.
WINDER. A tread with
nonparallel edges.