system labels and airflow arrows: match the final as-built system inspection, tab, startup, punch & closeout duct labels airflow arrows system identification supply return exhaust label the actual final system, service, and airflow direction in the required locations using durable, readable identifiers that match the as-built documents. wrong labels waste service time and can cause dangerous mistakes on exhaust, outside-air, or life-safety systems. project identification specification, approved drawings, as-built markups can you confirm the final system name and airflow direction before i place these permanent labels?