Secure Buildings: Outdoor Release
Airflow and Polutant Transport Group
Lawrence Berkeley National Laboratory Logo Blue steps Blue steps Indoor Environment Department
Advice for Safeguarding Buildings
Against Chemical or Biological Attack
Pre-Event Advice
During Release
Indoor Release
Outdoor Release
Unknown Release
Vulnerability Assessment
Training Aids
Related Links
Contact Us
Printer Version
Privacy, Security and Disclaimer Notice
Last Updated
April 27, 2005

Outdoor Release

For a release into a building air intake, shut off the supply from that intake, but otherwise follow the advice for an indoor release; in particular, evacuate the building.

For an open-air outdoor release, do the following:

  • Shut off HVAC fans.
  • Close fresh air intake dampers.
  • Close exhaust dampers: with the HVAC off, they can act as intakes.
  • Turn off exhaust fans in bathrooms, utility rooms, kitchens, etc.; these are commonly controlled separately from the HVAC system.
  • Close windows and doors.
  • People should stay indoors, unless authorities give an evacuation order.
  • People should retreat to a safe zone in the interior of the building.
Home : Printer Version : Contact Us : Webmaster
Airflow and Polutant Transport Group : Indoor Environment Department : Berkeley Lab