6.6.12 Checklist – Chemical, Biological & Radiological Protective Measures
- Place air intakes servicing occupied areas as high as practically possible (minimum 12 feet above ground). GSA may require locating at fourth floor or above when applicable.
- Restrict access to critical equipment.
- Isolate separate HVAC zones and return air systems.
- Isolate HVAC supply and return systems in unsecured areas.
- Physically isolate unsecured areas from secured areas.
- Use positive pressurization of primary egress routes, safe havens, and/or other critical areas.
- Commission building throughout construction and prior to taking ownership.
- Provide redundant, easily accessible shutdown capabilities.
- For higher levels of protection, consider using contaminant-specific filtration and detection systems.
- Incorporate fast-acting, low-leaking dampers.
- Filter both return air and outdoor air for publicly accessible buildings.
- Select filter efficiencies based upon contaminant size. Use reputable filter media installed into tight-fitting, gasketed, and secure filter racks.
- For higher threat areas (mail room, receiving, reception/screening lobby):
- Preferably locate these areas outside the main building footprint.
- Provide separate HVAC, with isolated returns capable of 100% exhaust.
- Operate these areas at negative pressure relative to secure portion of the building.
- Use air-tight construction, vestibules, and air locks if there is high traffic flow.
- Consider installation of an emergency exhaust fan to be activated upon suspected internal CBR release.
- Lock, secure, access-log, and control mechanical rooms.
- In public access areas, use air diffusers and return air grills that are secure or under security observation.
- Zone the building communication system so that it is capable of delivering explicit instructions, and has back-up power.
- Create safe zones using enhanced filtration, tight construction, emergency power, dedicated communication systems, and appropriate supplies (food, water, first aide, and personal-protective equipment).