Pre-Event – Immediate Advice

Secure building plans and HVAC plans from unauthorized access.

A terrorist who wants to maximize the casualties from an indoor chem/bio attack, or to target specific people, can use knowledge of the building's ventilation system: how many ventilation zones does the building have, which air vents serve which rooms, etc. The easiest way to determine these facts is from the building plans.

Building plans and ventilation system details should be available only to people who need them. If they are provided to contractors for building work, they should be recovered after use if possible. Building managers and maintenance personnel should be wary of requests for information about ventilation system details.

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