What should always be ensured regarding firestop products?

The correct choice emphasizes the importance of ensuring that firestop products match the tested system in which they are utilized. Firestop systems undergo rigorous testing to establish their effectiveness in preventing the spread of fire and smoke through openings in walls, floors, and ceilings. Each system is designed with specific components that work together to achieve the desired level of fire resistance.

When firestop products are selected, they must align with the tested system specifications to maintain the integrity of fire protection. Using products that do not match the tested system can lead to potential failure in fire containment, ultimately compromising safety and violating building codes. Therefore, ensuring compatibility with the tested system is critical for maintaining safety standards in construction and renovation projects.

Other factors such as the latest market trends, application by professionals, or color variety may be important in a broader context, but they do not directly influence the firestop's performance in terms of safety and compliance as matching the tested system does.