Naturally ventilated Core and Shell projects must provide the potential for tenant build-out to meet requirements of this credit. When documenting the credit, you can provide an assumed tenant layout and default occupancy assumptions based on the LEED Reference Guide Appendix 1 to confirm that tenant spaces meet ASHRAE-62.1 requirements.
The Carbon Trust guide offers guidelines on window sizes, spacing and placement for non-residential buildings. These guidelines can be used as a great starting point to ensure sufficient fresh air is provided to the building with natural ventilation. Reference the guide early in design will help maximize benefits and ensure compliance.
Review the requirements of the Carbon Trust Good Practice Guide 237 (1998) and the flow diagram process shown in Figure 18 of the Chartered Institution of Building Services Engineers (CIBSE) Applications Manual 10-2005, Natural Ventilation in Non-Domestic Buildings.
Consider the potential cost implications and benefits of supplying an additional 30% of outdoor air. This may bring additional costs in the form of increased energy demand for conditioning greater air volumes and upsizing HVAC systems and fans. It is intended to bring more fresh air to occupants, potentially increasing their comfort and productivity.
