What is the maximum leakage allowed for a through-penetration firestop system?

The maximum leakage allowed for a through-penetration firestop system is based on maintaining the integrity of fire-rated assemblies while allowing for some measure of airflow. The correct answer specifies a permissible leakage rate of 50 cubic feet per minute for any 100 square feet of wall area. This standard is crucial for providing a balance between the effectiveness of the firestop system and ventilation requirements, ensuring that firestopping materials are effective in slowing or preventing the spread of fire and smoke through penetrations.

The specified leakage rate also aligns with building codes and fire safety regulations intended to protect life safety and property during a fire event. Adequate firestop systems significantly contribute to the overall safety and performance of wall assemblies in commercial buildings, and understanding those limits helps inspectors ensure compliance with fire safety standards.