eFlow-MAX+ Dual Flow High-Capacity Constant Airflow Regulator


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eFlow-Max +Dual Flow is a motorized High Capacity Constant Airflow Regulator (CAR) that allows for two CFM setpoints. Controlled by Belimo actuator or equivalent.

Operating Pressure Range 0.2 to 4.0 in w.g. (50-1000Pa)

eFlow-MAX+Dual Flow is a motorized High-Capacity Constant Airflow Regulator (CAR) that allows for two CFM setpoints.

Its design saves significant amounts of energy, money and provides High Indoor Air Quality. This round damper is designed to provide pressure-independent minimum and maximum controlled constant airflow in a duct system.

eFlow-MAX+Dual Flowcan be easily installed inside standard ductwork. Mounting may be horizontal or vertical.

eFlow-MAX+ Dual Flowfeatures laser-welded, heavy galvanized steel body, aluminum control plate, solid plastic airflow control and airtight seal to ensure no-leak fit. It is available with 24 volts or 120 volts control. It is also available in stainless steel.

eFlow-MAX+is maintenance free and corrosion-proof under normal constitutions.

Diameter and CFM Range

eFlow-MAX+ DF 5” Airflow Range 60-165 CFM, eFlow-MAX+ DF 6” Airflow Range 100-265 CFM, eFlow-MAX+ DF 8” Airflow Range 150-530 CFM, eFlow-MAX+DF 10” Airflow Range 295-940 CFM, eFlow-MAX+DF 3” Airflow Range 24-75 CFM, eFlow-MAX+DF 4” Airflow Range 40-130 CFM

Control Type

120 Volts, 24 Volts

Key Features

Updated Features:

  • Enhanced, easy-to-adjust, durable CFM control
  • Lock-in nub for easy and secure CFM adjustment
  • No tools required to adjust CFM setpoint
  • Clearly readable scale with CFM and CMH volume flow indicators
  • Ideal for visible installation


● Diameters offered: 3”, 4″, 5”, 6”, 8″, 10″
● Operating Pressure Range: 0.2 to 4.0 in w.c. (50-1000Pa)
● Airflow settings: 24-940 CFM
● Allows for two CFM setpoints for dual flow control
● Controlled by Belimo actuator or equivalent
● 24 volts or 120 volts control
● Temperature Limits: -22° to 212°F (-30° to 100°C)
● Suitable for both supply and exhaust applications
● Factory calibrated
● 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).
● Optimum air velocity: 885 FPM (4.5 m/s) and it should not drop below 530 FPM (2.7 m/s)
● Sound power levels shall not exceed those for each size and CFM rating as scheduled.
● Laser-welded, heavy galvanized steel body, plastic airflow control and air tightness seal to ensure no-leak fit
● Available in stainless steel
● Available with 25mm or 50mm insulation shell
● Energy efficient
● Ideal solution for meeting rooms, classrooms, concert halls, etc.
● Maintenance-free and corrosion-proof under normal conditions
● Warranty guaranteed for Five (5) years



● Energy Efficiency Programs
● Subsidized Housing Projects
● Government Facilities
● Military facilities
● Healthcare
● High Rises
● Commercial Buildings
● Residential Buildings
● Assisted Living Facilities
● Hospitality/Hotels
● 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


Warranty is guaranteed for five (5) years, from the date of shipment, against all defects in material, given that the material has been installed and used under normal conditions. The warranty is limited to the repair or replacement of the material upon its return freight paid to our factory. This warranty is not transferable and is limited to the original end user.

Technical Data Download

eFlow-MAX+ Dual Flow High-Capacity Constant Airflow Regulator Submittal Data Sheet

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