With ASHRAE 170 as a Continuous Maintenance Document, addenda are frequently published, although not mandated by the state’s adoption process. Members of the ASHRAE 170 committee will provide an overview of changes that have been incorporated into the 2021 published edition as incorporated by the FGI Guidelines along with more recent updates that have been approved or are presently in the works. Additionally, a preview will be provided of the newly drafted operational guideline for healthcare facilities.