Penetrations made in a smoke barrier require what in addition to the approved fire stop system?

When it comes to smoke barrier penetrations, an L rating, which refers to the leakage rating, is crucial. This rating measures how much air can pass through a firestop system when exposed to certain conditions.

The purpose of the L rating is to ensure that the firestop system not only prevents the spread of flames and high temperatures, but also limits the transmission of smoke, which is equally hazardous during a fire incident. Adequate smoke control is critical to protect life safety by limiting visibility impairment and toxic gas exposure.

In addition to the firestop system, having an L rating is essential in confirming the integrity of the smoke barrier and ensuring it complies with building codes and safety standards. This rating highlights the effectiveness of the firestop in reducing smoke movement, thus maintaining better safety standards in the event of a fire, compared to simply using materials or sealants without considering their leakage characteristics.