eFlow-Alize Constant Airflow Regulator is a 2-in-1 constant airflow regulator (CAR) and grille combo. Offers two models: single airflow and dual airflow. eFlow-Alize CAR is a factory-set constant airflow regulator designed to save energy by precisely controlling airflow, regardless of static pressure, while providing high IAQ. Designed to operate is pressure range 0.2” w.c. to 0.6” w.c. They automatically adjust for variable duct pressure caused by building pressure, thermal stack effect and other variable factors.