Calculations should note the size of operable windows, trickle vents and louvers, and indicate the effects of both wind and stack-induced pressure differentials on the building’s ventilation and airflow.
Your analysis must address major building factors, including building orientation, to determine exposure to sun and wind; the amount of glazing; internal heat gains; and local weather conditions.
Assess what documentation presently exists that shows the system’s compliance with the natural ventilation criteria. Choose one of the following options to show compliance.
Naturally ventilated buildings can attempt this credit, but the requirements are more challenging. You’ll need to produce design diagrams or analytic models illustrating compliance with the relevant standards. This compliance path is rarely pursued for existing building certifications, due in part to the simple lack of many naturally ventilated buildings pursuing LEED-EBOM certification.
Conduct a second set of airflow measurements and compare these to your original VRP calculations to verify that the outdoor air rate for each ventilation system is at least 30% better than ASHRAE 62.1-2007.
You can increase ventilation rates by adjusting all dampers and louvers in the ventilation system throughout the building. In addition, visually inspect all intake vents and registers and remove any obstructions that restrict outdoor airflow.
