Circular Duct Fan: 310-1900 m3/h for Round Ducts

Metal circular duct fans with 100-315 mm diameters, 310-1900 m3/h airflow and up to 700 Pa pressure for supply and exhaust ventilation.

Model Circular Duct Fan

Core Parameters

Duct DiametersΦ100 / Φ125 / Φ150 / Φ160 / Φ200 / Φ250 / Φ315 mm Air Volume Range310 – 1900 m³/h (depending on model) Motor Power85 – 260 W (depending on model) Noise Level50 – 65 dB(A)

Key Features

All-metal circular housing, integrally formed, rust-proof and corrosion-resistant, sturdy and non-deformable Pure copper motor with high-quality bearings for low noise and stable airflow Optimized air duct design for high pressure and long-distance air delivery Flexible installation, can be combined with other fan types for various applications

Applications

HVAC duct systems

Home rooms

Office ventilation

Technical Parameters

MIWIND circular duct fans use a metal round housing for supply or exhaust air in circular duct systems. The series covers 100-315 mm duct diameters, 310-1900 m³/h airflow, 315-700 Pa pressure and 50-65 dB noise across the listed models.

Circular Duct Fan Model Range

Model	Power (W)	Air Volume (m³/h)	Pressure (Pa)	Noise (dB)	Diameter (mm)
MFJ10-35B	85	310	315	52	100
MFJ12-45B	85	385	350	50	125
MFJ15-55B	105	720	443	53	150
MFJ16-55B	126	850	470	55	160
MFJ20-66B	160	1120	580	60	200
MFJ25-66B	182	1320	570	62	250
MFJ31-66B	260	1900	700	65	315

How to Choose a Circular Duct Fan

Match the duct diameter: select a model that fits the round duct or use a properly designed transition.
Set the air volume: determine the required m³/h at the operating point, not only the free-air maximum.
Check pressure: include filters, grilles, dampers, bends and duct length in the static-pressure calculation.
Confirm sound: compare the listed noise range with the distance to occupied rooms and use isolation where needed.
Plan service access: leave space for inspection, cleaning and motor replacement.

Supply and Exhaust Applications

Circular duct fans can support fresh-air supply, bathroom or utility exhaust, workshop ventilation and branch-duct airflow. Compare the MIWIND fresh-air system range when the project needs filtered outdoor air or longer duct runs. Use the exhaust fan range when the main requirement is removing moisture, odor, heat or process air.

Installation and Maintenance

Install the fan in the airflow direction shown by the product marking, support the duct and avoid unnecessary turbulence at the inlet and outlet. Check the connections for leakage, keep the motor and housing clean, and inspect the fan when airflow or sound changes. The pressure and airflow data should be checked again after filters or grilles are added.

Request a Model Recommendation

Send the duct diameter, required air volume, estimated pressure loss, operating schedule and expected quantity through the MIWIND contact form for a project recommendation.