A penetration, in firestopping, is an opening, such as one created by the use of a cast-in-place sleeve, in a wall or floor assembly required to have a fire-resistance rating, 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).
See also
Sleeve (construction) Passive fire protection Annulus (firestop) Joint (building) Penetrant (mechanical, electrical, or structural) Mortar (firestop) Firestop pillow Fire test
References
External links Penetration seals (firestops) treatise by Warrington labs Penetration seals (firestops) treatise by Nuclear Regulatory Commission Penetration seal (firestop) vendor listings by Thomas Register