to achieve maximum effectiveness of the ventilation provided by
optimizing proper air mixing and flow.
For mechanically ventilated spaces:
Increase outdoor air ventilation rates by 30% above minimum rates
required by ASHRAE 62.1-2004.
For naturally ventilated spaces:
Follow the recommendations in the Carbon Trust Good Practice Guide
237  for occupied spaces. Determine that natural ventilation
is an effective strategy for the project.
AND use diagrams and calculations to show that the design of the
natural ventilation systems meets the recommendations set forth in
the CIBSE Applications Manual 10: 2005, Natural ventilation in
OR use a macroscopic, multi-zone, analytic model to predict that
room-by-room airflows will effectively naturally ventilate for at
least 90% of occupied spaces.
- This credit may require extensive documentation.
- This credit is frequently achievable with proper application of
underfloor air distribution systems.
- Combine heat recovery to minimize additional energy
- Consider potential energy savings lost due to increased
- Primarily applicable to specific building types, including:
healthcare facilities, high-level containment laboratory spaces,
micro-electron manufacturing plants, etc.
- Displacement ventilation systems are effective systems to earn
this credit. However, they require closely monitored construction
- 27% of all California LEED Certified projects achieved this
credit for LEED v2.1.
Additional EDR Resources
Studies: Displacement Ventilation in Classrooms
Design Briefs: Indoor Air
Design Briefs: Underfloor Air Distribution and Access
Guidelines: HVAC Simulation Guidelines - Underfloor Air
Distribution and Thermal Placement Ventilation
Briefs: Commercial Kitchen Ventilation Design