All of the links below will cause you to exit the Federal Executive Board's website.
However, the information is provided as a collection of useful resources that we hope will be helpful to you in designing your plan for Sheltering-in-Place.
CDC - Chemical Agents: Facts about Sheltering in Place
Homeland Security: Shelter In Place
OSHA: Shelter In Place
Homeland Security: Every Business Should Have a Plan
Advice for Safeguarding Buildings: Pre-Event - Establish internal "safe zones"
Advice for Safeguarding Buildings Against Chemical or Biological Attack: Outdoor Release
Advice for Safeguarding Buildings Against Chemical or Biological Attack: Indoor Release
Secure Buildings: Response to an Indoor Chemical or Biological Attack - HVAC information