For a room protected by a clean agent system that contains an HVAC return grill, which component is required?

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Multiple Choice

For a room protected by a clean agent system that contains an HVAC return grill, which component is required?

Explanation:
When a room protected by a clean agent system has an HVAC return path, it must be isolated from the building’s air distribution during agent release to keep the agent concentration in the room and prevent it from being drawn into the return ducts. The device that provides this isolation is a damper installed in the return air path and interlocked with the clean agent system so it closes automatically on discharge. An air filter, a backdraft damper, or just an air vent does not reliably seal the return path during release, so they don’t meet the requirement.

When a room protected by a clean agent system has an HVAC return path, it must be isolated from the building’s air distribution during agent release to keep the agent concentration in the room and prevent it from being drawn into the return ducts. The device that provides this isolation is a damper installed in the return air path and interlocked with the clean agent system so it closes automatically on discharge. An air filter, a backdraft damper, or just an air vent does not reliably seal the return path during release, so they don’t meet the requirement.

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