Building Ventilation / MFJ

Circular Duct Fan

Round connections. Direct duct integration.

A circular housing with inlet and outlet ports, a direct-connected centrifugal passage and backward-curved impeller for compatible duct diameters.

Round duct connectionsBackward-curved impellerExternal terminal box

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PRODUCT FEATURES

Details designed around use.

Round duct connections

Ports match specific duct diameters.

Backward-curved impeller

Works with the direct-connected centrifugal passage.

External terminal box

Uses an external flame-retardant plastic terminal box.

DESIGN & OPERATION

From operating principles to everyday use.

Round connections for ducted ventilation

The circular housing connects to ducts and a centrifugal impeller generates mechanical ventilation. Filtration depends on separate filters in the system.

Metal body and direct drive

The documentation describes a coated metal body and a direct-drive centrifugal impeller. Confirm installation direction, mounting and maintenance for the specific model.

INSIDE THE PRODUCT

Explore the construction and functions.

Circular Duct Fan: components and functions — Components and construction

Circular Duct FanCircular housing and mounting bracket — Circular housing and mounting bracket

Circular Duct FanCircular duct connections — Circular duct connections

SPECIFICATIONS

Specifications at a glance.

Specification index
Product series	MFJ
Product category	Duct Fans
Construction feature	Round duct connections
Selection information	See the dimension and performance charts on this page

Specifications follow the corresponding product documents. Do not combine figures from different models. Confirm operating conditions and the supplied configuration.

Circular Duct Fan: dimensions, construction and performance charts — Dimensions and specifications - click to enlarge

Building Ventilation — application illustration

APPLICATION & SELECTION

Move air where it is needed.

Cabinet fans, duct fans and filter boxes work together for central ventilation, zoned exhaust and duct filtration.

Before selecting a product

Required airflow and static pressure, duct diameter and resistance, installation position and power supply.

Application illustration, not a record of a completed project.

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PRODUCT QUESTIONS

Questions about this product

What are the key features of the Circular Duct Fan?

Round duct connections：Ports match specific duct diameters.；Backward-curved impeller：Works with the direct-connected centrifugal passage.；External terminal box：Uses an external flame-retardant plastic terminal box.

What should I check before selecting the Circular Duct Fan?

Please confirm: Required airflow and static pressure, duct diameter and resistance, installation position and power supply.