Secure Buildings: Outdoor Release
Airflow and Polutant Transport Group
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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.
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