855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 529
Extracted Content
PATH 2. CONSIDER EXTREME COLD
Demonstrate with a thermal model or through Passive House certification that the building will passively maintain habitable conditions for at least two days during a power outage in cold, winter months. The two-day period must represent the peak wintertime conditions of a TMY.
Option 4. Operable Windows
During a power outage, ventilation may rely on operable windows, doors, or other openings to maintain airflow. Operable windows can also be used for thermal comfort depending on outside weather conditions and may minimize reliance on building systems and support adaptability for future changes in building use.
For this option, design operable windows to support ventilation in at least 50% of the regularly occupied floor area. Specify and size the windows to meet minimum window opening area and locations. The natural ventilation procedure in ASHRAE 62.1-2022 Section 6.4 includes calculations and minimum openable area tables for determining these minimums. The opening sizes and locations will depend on the designer’s approach to opening placement. For example, openings may be placed on one side of a zone, on opposite sides of a zone, or in the corner of a zone. The information provided in the tables is based solely on buoyancy-driven flow and does not address thermal comfort.
DOCUMENTATION
| Project types | Options | Paths | Col4 | Documentation |
|---|---|---|---|---|
| All | Option 1. Management Mode for Episodic Outdoor Ambient Conditions | All | Design documents confirming management mode design and sequence of options. | Design documents confirming management mode design and sequence of options. |
| All | Option 1. Management Mode for Episodic Outdoor Ambient Conditions | All | Final Commissioning Report, confirming that management mode was tested during Commissioning. | Final Commissioning Report, confirming that management mode was tested during Commissioning. |
| All | Option 2. Management Mode for Respiratory Diseases | All | Design documents confirming management mode design and sequence of options. | Design documents confirming management mode design and sequence of options. |
| All | Option 2. Management Mode for Respiratory Diseases | All | Final Commissioning Report, confirming that management mode was tested during Commissioning. | Final Commissioning Report, confirming that management mode was tested during Commissioning. |
| All | Option 3. Design for Occupant Thermal Safety during Power Outages | Path 1 and Path 2 | Thermal model report and results and identify thermal safety zones. | Thermal model report and results and identify thermal safety zones. |
| All | Option 4. Operable Windows | All | ASHRAE Standard 62.1 calculations for opening areas and distances for all regularly occupied spaces. | ASHRAE Standard 62.1 calculations for opening areas and distances for all regularly occupied spaces. |
| All | Option 4. Operable Windows | All | Percentage of spaces with operable windows. | Percentage of spaces with operable windows. |
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 519