Technical

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Technical

Annular Space

The opening around a penetrating item.

F-Rating

The time period that the through-penetration firestop system limits the spread of fire through the penetration when tested in accordance with ASTM E 814 or UL1479.

Fireblocking

Building materials, or materials approved for use as fireblocking, installed to resist the free passage of flame to other areas of the building through concealed spaces.

Fire-Resistant Joint System

An assemblage of specific materials or products that are designed, tested and fire-resistance rated in accordance with either ASTM E 1966 or UL 2079 to resist for a prescribed period of time the passage of fire through joints made in or between fire-resistance rated assemblies.

Joint

The opening in or between adjacent assemblies that is created due to building tolerances, or is designed to allow independent movement of the building in any plane caused by thermal, seismic, wind or any other loading.

L-Rating

The air leakage rating of a through penetration firestop system or a fire-resistant joint system when tested in accordance with UL 1479 or UL 2079, respectively.

Membrane Penetration

A breach in one side of a floor-ceiling, roof-ceiling or wall assembly to accommodate an item installed into or passing through the breach.

Penetration Firestop

A through-penetration firestop or a membrane-penetration firestop.

Perimeter Fire Barrier System

An assemblage of specific materials along the perimeter of a floor with an hourly fire endurance rating and a non-rated exterior curtain wall to ensure continuity of the separating function of the floor assembly. Tested in accordance with ASTM E2307.

Splice

The result of a factory and/or field method of joining or connecting two or more lengths of a fire-resistant joint system into a continuous entity.

Penetration Firestop

A through-penetration firestop or a membrane-penetration firestop. *Although ducts may be considered penetrations, the requirements for maintaining the fire rating of the assembly penetrated by ducts are beyond the scope of this document.

T-Rating

The time period that the penetration firestop system, including the penetrating item, limits the maximum temperature rise to 325°F (163°C) above its initial temperature through the penetration on the non-fire side when tested in accordance with ASTM E 814 or UL 1479.

Through-Penetration Firestop System

An assemblage consisting of a fire-resistance-rated floor, floor-ceiling, or wall assembly, one or more penetrating items passing through the breaches in both sides of the assembly and the materials or devices, or both, installed to resist the spread of fire through the assembly for a prescribed period of time.