A penetration, in

firestop A firestop or fire-stopping is a form of passive fire protection that is used to seal around openings and between joints in a fire-resistance-rated wall or floor assembly. Firestops are designed to maintain the fire-resistance rating of a wall ...

ping, is an opening, such as one created by the use of a cast-in-place

sleeve A sleeve (, a word allied to '' slip'', cf. Dutch ) is the part of a garment that covers the arm, or through which the arm passes or slips. The sleeve is a characteristic of fashion seen in almost every country and time period, across a myri ...

, in a wall or floor assembly required to have a

fire-resistance rating A fire-resistance rating typically means the duration for which a passive fire protection system can withstand a standard fire resistance test. This can be quantified simply as a measure of time, or it may entail other criteria, involving eviden ...

, for the purpose of accommodating the passage of a mechanical, electrical, or structural penetrant. The penetration may or may not contain a firestop system. A penetration (opening) may or may not include a penetrant (something passing through the opening). File:Cans_form_penetrations.jpg,

Sheet metal Sheet metal is metal formed into thin, flat pieces, usually by an industrial process. Thicknesses can vary significantly; extremely thin sheets are considered foil (metal), foil or Metal leaf, leaf, and pieces thicker than 6 mm (0.25 ...

cans are nailed to form boards where

concrete Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid over time. It is the second-most-used substance (after water), the most–widely used building material, and the most-manufactur ...

is about to be cast. The cans are located by the plumber. Once the penetrants are in place, one can

. File:Sprinkler branch penetration.jpg, A penetration, in this case without a

. File:Mortar tag.jpg, A firestopped penetration

References

External links

Penetration seals (firestops) treatise by Warrington labs

Penetration seals (firestops) treatise by

Nuclear Regulatory Commission The United States Nuclear Regulatory Commission (NRC) is an independent agency of the United States government tasked with protecting public health and safety related to nuclear energy. Established by the Energy Reorganization Act of 1974, the ...

Penetration seal (firestop) vendor listings by Thomas Register
{{Fire protection, state=collapsed Passive fire protection Building engineering Firestops

See also

References

External links