Penetrations made in a smoke barrier require an L rating with the approved what?

In the construction and safety standards relating to smoke barriers, penetrations through these barriers must maintain the integrity of the barrier as a significant requirement to prevent smoke migration. An L rating, which denotes the air leakage rate, is crucial for ensuring that any openings or penetrations do not allow excessive smoke to pass through in the event of a fire.

The approved fire-stop system is specifically designed to seal openings and penetrations in fire-resistance-rated walls, floors, or ceilings, hence why it is the correct answer. These systems use materials and methods that can effectively block the passage of smoke and flames, adhering to fire safety codes and standards. By using an approved fire-stop system, you ensure that the penetration meets the required L rating for smoke barriers, limiting the flow of smoke from one compartment to another in a building, which is essential for maintaining safety and compliance.

In contrast, the other options do not pertain directly to maintaining the smoke barrier integrity in the context of penetrations. A draft system generally deals with controlling airflow but does not specifically address the sealing of penetrations in smoke barriers. A smoke control system focuses on managing smoke within a space but does not ensure that the barrier's integrity is preserved at points of penetration. A water spray system is