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Title: Section 903  •  Size: 6799

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SECTION 903 - DEFINITIONS

For the purpose of this chapter, certain terms are defined as follows:

AUTOMATIC FIRE-EXTINGUISHING SYSTEM is an approved system of devices and equipment which automatically detects a fire and discharges an approved fire-extinguishing agent onto or in the area of a fire.

FIRE DEPARTMENT INLET CONNECTION is a connection through which the fire department can pump water into a standpipe system, or sprinkler system.

PRESSURIZATION is the creation and maintenance of pressure levels in zones of a building, including elevator shafts and stairwells that are higher than the pressure level at the smoke source, such pressure levels being produced by positive pressures of a supply of uncontaminated air, by exhausting air and smoke at the smoke source, or by a combination of these methods.

PRESSURIZED STAIRWAY ENCLOSURE is a type of smoke-control system in which stairway enclosures are mechanically pressurized to minimize smoke contamination of them during a fire incident.

SMOKE is the airborne solid and liquid particulates and gases evolved when a material undergoes pyrolysis or combustion, including the quantity of air that is entrained or otherwise mixed into the mass.

SMOKE BARRIER is 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.

SMOKE-CONTROL MODE is a predefined operational configuration of a system or device for the purpose of smoke control.

SMOKE-CONTROL SYSTEM, MECHANICAL, is an engineered system that uses mechanical fans to produce pressure differences across smoke barriers or establish airflows to limit and direct smoke movement.

SMOKE-CONTROL SYSTEM, PASSIVE, is a system of smoke barriers arranged to limit the migration of smoke.

SMOKE-CONTROL ZONE is a space within a building enclosed by smoke barriers.

SMOKE DAMPER is a device that meets the requirements of approved recognized standards, and is designed to resist the passage of air or smoke. A combination fire and smoke damper shall meet the requirements of approved recognized standards. See Chapter 35, Part III.

SMOKE EXHAUST SYSTEM is a mechanical or gravity system intended to move smoke from the smoke zone to the exterior of the 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.

STACK EFFECT is the vertical airflow within buildings caused by temperature differences.

STANDPIPE SYSTEM is a wet or dry system of piping, valves, outlets and related equipment designed to provide water at specified pressures and installed exclusively for the fighting of fires, including the following:

Class I is a standpipe system equipped with 21/2-inch (63.5 mm) outlets.

Class II is a standpipe system directly connected to a water supply and equipped with 11/2-inch (38.1 mm) outlets and hose.

Class III is a standpipe system directly connected to a water supply and equipped with 21/2-inch (63.5 mm) outlets or 21/2-inch (63.5 mm) and 11/2-inch (38.1 mm) outlets when a 11/2-inch (38.1 mm) hose is required. Hose connections for Class III systems may be made through 21/2-inch (63.5 mm) hose valves with easily removable 21/2-inch by 11/2-inch (63.5 mm by 38.1 mm) reducers.

TENABLE ENVIRONMENT is an environment in which the quantity and location of smoke is limited or otherwise restricted to allow for ready evacuation through the space.

ZONED SMOKE CONTROL is a smoke-control system utilizing pressure differences between adjacent smoke-control zones.

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