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18-29-304.4  Openings for pipes.
   In or on structures where openings have been made in walls, floors or ceilings for the passage of pipes, such openings shall be closed and protected by the installation of approved metal collars that are securely fastened to adjoining structure. Openings shall have a cover consisting of concrete not less than 2 inches (50 mm) thick, heavy galvanized wire netting of 1/2 inch (12 mm) mesh, or other means for preventing passage of rodents. These requirements shall be in addition to any protection for penetrations of fire-rated assemblies required in Chapter 15-8.