This page contains document links to Construction Criteria Base

LEED®-DoD Antiterrorism Standards Tool

Analysis of LEED & Antiterrorism Issues & Strategies for New Construction & Existing Buildings


LEED Requirements

Provide at least an average of one operable window and one lighting control zone per 200 square feet for all regularly occupied areas within 15 feet of the perimeter wall.

Related AT Standards & Recommendations

  • AT Std 10: Windows, Skylights, and Glazed Doors
  • AT Std 16: Air Intakes
  • AT Std 18: Emergency Air Distribution Shutoff
  • AT Std 19: Utility Distribution and Installation
  • AT Rec 14: Asset Location
  • AT Rec 15: Room Layout
  • AT Rec 16: External Hallways
  • AT Rec 17: Windows

Issues & Strategies

  • Where appropriate, install operable windows to allow for natural ventilation. Natural ventilation has become an increasingly energy-efficient and attractive method for providing acceptable indoor air quality and maintaining a healthy, comfortable, and productive indoor climate rather than the more prevailing approach of using energy-intensive mechanical ventilation. Power sources are not needed to operate natural ventilation systems, so building occupants can maintain their level of comfort in the event of power shortages or blackouts. On the other hand, natural ventilation systems could bring outside contaminants inside. For critical and high-risk buildings, mechanical ventilation with special filters is recommended to protect against possible chemical, biological and radiological (CBR) agents from entering interior spaces. Although more energy will be used, mechanical ventilation does allow for precise control of humidity, preventing the growth of mold and mildew.
  • Operable windows on the perimeter walls are not recommended for buildings that do not meet the required minimum standoff distance. Operable blast resistant window systems are available and can be designed. However, these are generally not as effective as fixed windows and they can cost 2 to 5 times that of a comparable fixed window system.
  • Coordinate natural ventilation strategies with other ventilation, energy efficiency, and security strategies, including blast resistant glazing (see LEED EA Credit 1: Optimize Energy Performance).
  • Ensure that operable windows have appropriate locks and security gates to prevent intruders and falls from heights.
  • Locate low occupancy support areas on the side of the building most vulnerable to blast events. Keep in mind that the installation and distribution of utility systems should comply with the provisions of Standard 19.