View Sources Source(s) or Contributor(s) Pacific Northwest National Laboratory Duct Leakage to Outdoors Total Duct Leakage Tests On-site Inspection Procedures for Duct Leakage Testing Measure Guideline: Combustion Safety for Natural Draft Appliances Through Appliance Zone Isolation An in-depth look on how to perform a "total" and "outdoor" duct leakage test. Additionally, directories for common standards publishers are provided and listed. Attachment(s) Duct Leakage Testing Level 3 - Lecture Notes & Problem Sets.docx Lecture Length 1 hour Last Updated Date 2022-06-15