Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
That is correct that the Airflow Network (AFN) model is all or nothing -- you can't use it for duct losses and not also for infiltration/ventilation. To modify the air leakage in the AFN model, you will need to update the Effective Air Leakage Area inputs in all the AirflowNetwork:MultiZone:Surface:EffectiveLeakageArea objects. For example, if the IECC 2018 requirement in your climate zone is 5 ACH50 and you want to change it to 1 ACH50, you would divide all the ELA values by 5. If you have the air leakage characterized in a different metric (CFM50, SLA, etc.), you'll need to convert it to ELA or ACH50 first.
