Which of the following is likely NOT a feature of a well-designed firestop system?

A well-designed firestop system prioritizes several key features to ensure its effectiveness in preventing the spread of fire and smoke through penetrations in fire-rated assemblies. One significant aspect is the ease of installation, which allows for timely and efficient application, reducing the chances of errors that could compromise the system's integrity.

Additionally, a well-designed firestop system will have an all-inclusive fire resistance rating, clearly indicating that it meets specific standards and regulations. This rating is crucial for compliance with fire safety codes and contributes to overall building safety.

Minimization of air leaks is another critical feature because air leaks can facilitate the passage of smoke and flames, undermining the firestop's primary purpose. A properly designed firestop effectively seals openings to maintain the fire rating of the assembly.

Increased installation complexity, however, is not a desirable characteristic of a well-designed firestop system. A complex installation process can lead to errors, increased labor costs, and delays, ultimately compromising the system's reliability and effectiveness. Therefore, the focus of firestop design is on simplicity and effectiveness, making the chosen answer accurate.