eFlow-MAX High Capacity Constant Airflow Regulator


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eFlow-MAX is a field adjustable High Capacity Constant Airflow Regulator. It is designed to automatically and precisely balance airflow into or out of a space without the need for electricity. Its design saves significant amount of energy, money and provides High Indoor Air Quality. This round damper is designed to provide pressure-independent maximum constant airflow in round duct systems without use of electricity, sensors or controls.

Weight 8 lbs
Dimensions 8 × 8 × 8 in

eFlow-Max 10" Airflow Range 295-940 CFM, eFlow-Max 12" Airflow Range 470-1650 CFM, eFlow-Max 14" Airflow Range 530-1885 CFM, eFlow-Max 16" Airflow Range 590-2355 CFM, eFlow-Max 3" Airflow Range 24-75 CFM, eFlow-Max 4" Airflow Range 40-130 CFM, eFlow-Max 5" Airflow Range 60-165 CFM, eFlow-Max 6" Airflow Range 100-265 CFM, eFlow-Max 8" Airflow Range 150-530 CFM

Key Features

● 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
● Temperature Limits: -22° to 212°F (-30° to 100°C)
● Suitable for both supply and exhaust applications
● No external power supply needed
●Factory calibrated
● 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).
● 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
● 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

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

Eaqual to American aldes mr max high capacity constant airflow regulator, Young regulaor constant volume damper cvdxx 



● 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, MAX Low Flow and Max Dual Flow Submittal Data Sheet

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eFlow-MAX Installation and Adjustment Instructions

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