The CAR3® Constant Airflow Regulator is a pressure independent balancing damper that automatically regulates airflow in duct systems to constant levels. The CAR3® requires no electric or pneumatic power or sensors, and works solely off system pressure. The patent pending dual-side airflow adjustment dial and CFM indicator allows you to set or change the airflow quickly, in supply or exhaust applications, without removing the CAR3® from the duct. The CAR3® is proudly made in the USA and recently recognized as AHR Expo 2021 Innovation Awards winner! CAR3® is constructed of amorphous thermoplastic resin enhanced with antimicrobial, anti-static, and flame retardant additives to improve material performance, reduce the need for maintenance, and increase safety. CAR3® is UL 2043 safety classified and labeled for flame and smoke generation. (File No. R39897).