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Penetrants, orpenetrating items, are the mechanical, electrical or structural items that pass through an opening in a wall or floor, such aspipes,electrical conduits,ducting,electrical cables andcable trays, orstructural steel beams and columns. When these items pierce a wall or floor assembly, they create a space between the penetrant and the surrounding structure which can become an avenue for the spread of fire between rooms or floors.Building codes require afirestop to seal the openings around penetrants.
