Why is room integrity (air leakage) critical in SHS design?

Why is room integrity (air leakage) critical in SHS design?

• A. It has no effect
• B. It determines the color of the agent
• C. Leakage affects agent quantity and dissipation
• D. It only matters for CO2

Answer: (C)

Room integrity is about how well a space resists air leakage after the agent is released. In SHS design, achieving and maintaining the target concentration for the required hold time depends on minimizing losses through leaks. If there are air leaks through doors, walls, penetrations, or ventilation paths, the agent escapes to adjacent spaces, dilutes faster, and the hold time is shortened unless more agent is released. That’s why the amount of agent needed is directly tied to how leaky the room is and how long the space can stay above the design concentration. Better room integrity reduces losses, so you can meet the design with less agent and a longer effective hold time. This concept applies to all clean-agent systems, not just CO2, and it isn’t about the agent’s color.

Room integrity is about how well a space resists air leakage after the agent is released. In SHS design, achieving and maintaining the target concentration for the required hold time depends on minimizing losses through leaks. If there are air leaks through doors, walls, penetrations, or ventilation paths, the agent escapes to adjacent spaces, dilutes faster, and the hold time is shortened unless more agent is released. That’s why the amount of agent needed is directly tied to how leaky the room is and how long the space can stay above the design concentration. Better room integrity reduces losses, so you can meet the design with less agent and a longer effective hold time. This concept applies to all clean-agent systems, not just CO2, and it isn’t about the agent’s color.