Inline Duct Exhaust Fan Manufacturers

Engineered duct fans for circular inline systems

Hangzhou Beron Motor Co., Ltd. designs and manufactures duct fans for supply and exhaust air handling in circular duct systems. The line is built around mixed-flow (diagonal) impellers that combine the high airflow of an axial fan with the high static pressure of a centrifugal fan, so a compact inline unit can serve both general ventilation and more demanding duct runs. We offer AC and EC drive versions in flange-mounted circular housings from 4 to 12 inches, with the motor, impeller and control chosen around the duty point.

We are a direct Duct Fan manufacturer with production and R&D centers in Hangzhou and Huzhou. Our 16 years of experience, 6,000 m² factory area and annual output of 60,000 units allow us to combine serial production discipline with project customization. It is also why we can supply Chinese-made brand replacement solutions that give global distributors and agents comparable European and American brand performance at a more competitive price.

• Target applications: HVAC ducting, central ventilation, booster/extract, fresh air systems, grow rooms, server rooms, commercial kitchens and workshops.
• Drive options: AC for continuous mains-voltage duty, EC for energy-saving variable-speed and networked control.
• Quality basis: every fan is checked through wind tunnel, noise, motor performance and aging laboratories before it leaves the factory.

AC Duct Fan and EC Duct Fan range

Within this category we supply two drive families: AC Duct Fan and EC Duct Fan. Both are inline circular units, but their motors, control behavior and operating economics are different.

AC Duct Fan

AC duct fans are the workhorses of continuous commercial and residential exhaust. They use a robust outer rotor motor that remains stable during continuous operation, and casing choices include flame-retardant plastic or galvanized steel depending on the environment. Current AC models include mixed-flow inline fans from 4 to 12 inches, a galvanized booster with variable speed controller, an ultra-quiet bathroom and kitchen model rated around 28 dB with thermal overload protection, a high-static-pressure centrifugal duct fan with backward-curved impeller and IP44 protection, and a continuous-run mixed-flow fan with 100% copper motor and Class F insulation.

For plant engineers specifying mains-voltage fans, AC duct fans provide a simple and cost-effective replacement path. Selected models are available in 110 V and 220 V dual-voltage versions for export projects.

EC Duct Fan

EC duct fans replace the AC induction motor with an electronically commutated motor. The result is up to 70% lower power consumption than standard AC models at the same operating point, with higher pressure and airflow available from the same frame size. Speed control is stepless through built-in or external controllers supporting PWM or 0-10 V signals, and Modbus RTU is available for intelligent networked control and fault diagnosis.

This makes EC duct fans the right choice for noise-sensitive and variable-demand applications such as offices, planting rooms, laboratories and ventilation systems that must respond to CO2, temperature or pressure sensors. For distributors, the wider performance envelope of one EC model can replace several AC SKUs and reduce stocking pressure.

Range and application matching

The table below maps representative duct fan configurations to common project scenarios. We can adjust impeller type, casing material and motor protection during the quotation stage.

Process and application fit

Duct fan selection is driven by system resistance, duct diameter and acceptable noise. A short extract run with low resistance suits a mixed-flow inline fan; a long duct with filters, bends or grease ducts needs a high-static-pressure model. For continuous fresh air duty, we use continuous-rated motors with copper windings and a higher insulation class.

Because our product line spans mixed-flow and centrifugal duct fans, we can propose the correct impeller for the system rather than forcing a single design. If the project involves higher pressure or industrial exhaust at equipment level, our Centrifugal Fan range may be more appropriate; for inline boosting and general duct ventilation, the duct fan line is the compact solution.

Engineering value, materials and critical specifications

As a manufacturer of micro-special motors and fans, we build duct fans around the motor rather than treating it as a purchased accessory. That gives us control over efficiency, noise, insulation and protection rating. For AC models we use outer rotor motors sized for continuous duty; for EC models we integrate drive electronics with the motor.

• Critical specifications: duct sizes 4-12 inch, 110 V and 220 V availability, thermal overload protection, IP44 on selected high-static-pressure models and IP55 test evidence for relevant products.
• Impeller options: mixed-flow geometry for high volume with compact size, and backward-curved impellers for static pressure and long ducts.
• Materials: galvanized steel for mechanical robustness, flame-retardant plastic for light duty, and balanced aluminum impellers for smooth running.
• Noise control: low-noise models around 28 dB, verified through laboratory tests.

Configuration, controls and automation integration

We configure the control system around the required line interface. AC duct fans can be supplied for fixed-speed operation or with an external variable-speed controller; the galvanized booster model is a standard example. EC duct fans accept PWM or 0-10 V analog signals and can be integrated with building management systems via Modbus RTU.

For OEM projects, we support non-standard voltage, frequency, power ratings and special-duty customization. We ask for the operating point and mechanical envelope, then adjust the motor winding, impeller width or housing material in the factory. EC speed control also gives repeatable airflow setpoints for sensor-based demand ventilation.

Quality assurance and acceptance testing

Every duct fan is produced under an ISO 9001:2015 quality management system and is sampled through wind tunnel, noise, motor performance and aging laboratories before shipment. Our products carry CE and CCC certification and have passed RoHS and UL tests. We are a National high-tech enterprise and a Zhejiang innovative small and medium-sized enterprise, with dozens of patents in fan structure, fluid, motor and control circuits.

For project orders we coordinate pre-shipment inspection, factory acceptance tests and third-party inspection when specified. We document nameplate information, packing lists and test records to keep installation and local approval straightforward.

Installation, maintenance and service support

Duct fans are supplied with flanged circular connections for direct mounting in the duct line. We recommend mechanical support independent of flexible duct, correct airflow direction marking, and an electrical supply with overload protection matching the nameplate. For EC models, the controller signal should be shielded if the cable run is long.

After-sales support includes product documentation, installation videos, online technical guidance and warranty service. We provide spare parts and can send engineers to site for larger orders under negotiated terms. The standard warranty is 12 months from shipment, covering repair or replacement for defects in raw materials or workmanship.

Packaging, delivery and commercial support

Duct fans are packed for export with protection on flanges, impellers and control boxes. We coordinate international logistics and customs clearance at the destination, and we can quote on FOB, DAP or DDP terms depending on the project. Standard product MOQ is typically 100 pieces; samples are available and the sample fee is deducted from the formal order.

For regular orders, production cycles are normally 25-30 days, with the exact delivery date confirmed before order placement. Payment terms include T/T, L/C and PayPal for small amounts.

Information we use to configure your duct fan solution

To prepare a configuration and quotation, we need the operating point and installation boundary. Send the following project data with your enquiry:

• Duct diameter and system layout: straight length, bends, dampers, filters, grilles.
• Required airflow in m³/h or CFM and static pressure in Pa at the fan inlet or outlet.
• Supply voltage, frequency and phase; any voltage tolerance or dual-voltage requirement.
• Control preference: fixed speed, external speed controller, PWM, 0-10 V or Modbus RTU.
• Noise limit in dB(A) and the measurement distance.
• Ambient temperature, humidity, dust or grease concentration.
• Certification and documentation requirements for the destination market.
• Quantity, packaging preference and target trade terms.

Duct fan FAQs

What is the difference between AC and EC duct fans?

The AC duct fan uses a mains-voltage outer rotor induction motor, giving simple continuous operation. The EC duct fan uses an electronically commutated motor with integrated electronics, reducing energy consumption by up to 70%, enabling stepless speed control through PWM or 0-10 V, and providing quieter operation. EC models are preferred when demand varies or when fans are linked to a building management system.

Which duct fan should I choose for a long duct run?

For long ducts, ventilation grilles and filters, select a high-static-pressure model with a backward-curved impeller. Our AC centrifugal duct fan with IP44 rating is designed for commercial kitchen, warehouse and factory exhaust. For moderate pressure in typical HVAC ducting, a mixed-flow inline duct fan gives high airflow with compact dimensions.

Can your duct fans run continuously?

Yes. The AC mixed-flow continuous-run fan is wound with 100% copper wire and Class F insulation, and selected models include thermal overload protection. EC duct fans are also suitable for continuous duty in variable-demand systems. We verify continuous operation in our aging laboratory before release.

What voltages and duct sizes are available?

Standard AC duct fans cover 4-, 6-, 8-, 10- and 12-inch circular duct sizes and are available in 110 V or 220 V versions; selected models support dual voltage. EC versions are supplied with AC input and internal DC drive electronics. Non-standard voltage and frequency can be supported for OEM projects.

Can you customize duct fans for OEM projects?

Yes. OEM and ODM are core services. Send your mechanical drawing, performance target or sample; our engineering team will evaluate motor winding, impeller geometry, casing material, control interface and certification requirements, then provide a professional solution and quotation.

What quality evidence do you provide with duct fan shipments?

We operate under ISO 9001:2015 and maintain CE, CCC, RoHS and UL evidence for relevant products. With each shipment we can provide test reports, nameplate photos, packing lists and, on request, pre-shipment inspection or factory acceptance test results.