eFlow-MAX High Capacity Constant Airflow Regulator

eFlow-MAX High Capacity Constant Airflow Regulator

eFlow-MAX is a field adjustable High Capacity Constant Airflow Regulator. This round damper is designed to provide automatic, precise, balanced pressure-independent maximum constant airflow in round duct systems without use of electricity, sensors or controls.  


  • Key Features
  • Application
  • Warranty

● Diameters offered: 3”, 4", 5”, 6”, 8", 10", 12”, 14”, 16"
● Operating Pressure Range: 0.2 to 4.0 in w.g. (50-1000Pa)
● Airflow settings: 24-2335 CFM -Suggested Air Speed: 885 FPM
● Temperature Limits: -22° to 212°F (-30° to 100°C)
● Suitable for both supply and exhaust applications
● No external power supply needed
● Field Adjustable CFM setpoint
● Capable of maintaining constant airflow within + 10% for nominal airflow > 60
CFM (100 m3/h) and + 5 CFM (10 m3/h) for nominal airflow < 60 CFM. (100 m3/h) throughout the target operating pressure range of 0.2 to 4.0 in.
w.g. (50 to 1000 Pa).

● Sound power levels shall not exceed those for each size and CFM rating as
● Laser-welded, heavy galvanized steel body, plastic airflow control and air
tightness seal to ensure no-leak fit
● Available in stainless steel
● Energy efficient
● Ideal solution for meeting rooms, classrooms, concert halls, etc.
● Maintenance free and corrosion-proof under normal conditions

Energy Efficiency Programs
Subsidized Housing Projects
Government Facilities
Military facilities
High Rises
Commercial Buildings
Residential Buildings
Assisted Living Facilities
Dormitories and Schools Buildings
Office buildings
Balancing airflow supply from roof-top A/C units
Balancing supply and exhaust of heat recovery ventilation systems
Regulating outdoor air-supply into individual room fan coil units or heat pumps
Balancing airflow on series-fan-powered terminal unit system


Guaranteed for 6 years, from date of shipment, against all defects in material, provided material has been installed and used under normal conditions.