The American National Standards Institute has approved the revised standard ANSI/ASSP Z9.14-2020, "Testing and Performance-Verification Methodologies for Biosafety Level 3 (BSL-3) and Animal Biosafety Level 3 (ABSL-3) Ventilation Systems"; the revision was published on March 31, 2020. ANSI/ASSP Z9.14-2020 focuses on performance verification of engineering controls related specifically to ventilation system features of BSL-3/ABSL-3 facilities. The revised standard has been enhanced to include new definitions; new guidance for developing corrective action plans and performing verification of conformance to regulations, appendices, risk assessment matrices, and checklists dedicated to performing a facility risk assessment; and numerous updates to the original content.