EFlow USA offers constant airflow regulator
EFlow USA released a constant airflow regulator available in 3 to 10-inch diameters. The UL-classified and factory-calibrated device provides automatic air balancing and optimized airflow distribution for better indoor air quality of commercial and residential buildings. The non-powered regulator is fully adjustable with a standard screwdriver to select required airflow of 10 to 500 cubic feet per minute.
EFlow USA LLC