Q: Why does the EC146 double-inlet centrifugal fan with a plastic volute have such a wide range of applications in high-end range hoods, laminar flow beds/laminar flow canopies, and humidification and purification equipment?

The EC146 plastic volute dual-inlet centrifugal fan is widely used in high-end range hoods, laminar flow beds/laminar flow hoods, and humidification and purification equipment. Its core advantage lies in its precise balance of the demanding requirements these three scenarios place on the fan: achieving high airflow, high static pressure, low noise, and intelligent speed control simultaneously within a compact size. Its dual-inlet structure, EC motor, and the material properties of the plastic volute precisely address the core pain points in these applications one by one.

Q: Why are EC double inlet centrifugal blowers used in low-noise applications?

The EC146 dual-inlet centrifugal fan is widely used because it systematically resolves three key contradictions: its dual-inlet structure balances airflow and uniformity, its EC motor balances efficiency and controllability, and its plastic scroll housing balances cleanliness, corrosion resistance, and cost. This systematic balancing capability makes it an ideal choice for compact equipment with stringent requirements for performance, reliability, noise, and dimensions.

Q: How noisy is the SF146C series?

Rated noise across the SF146C series spans 60–65 dB(A) depending on model and size. Because noise follows speed, the easiest way to reduce sound levels is to choose a smaller model at a lower speed for the same airflow, or a speed-controlled EC/DC version where available — ideal for noise-sensitive environments such as offices, laboratories and residential ventilation.

Q: What bearings do SF146C fans use, and how long do they last?

Models in the SF146C series use NSK ball bearings, which supports continuous-duty operation in HVAC and industrial ventilation. Bearing life depends mainly on operating speed and temperature: keeping inlet air clean, avoiding vibration and running at moderate speeds maximise service life. For an L10 life estimate at your exact operating point, contact our engineering team.

Q: Are SF146C fans suitable for dusty or outdoor environments?

Protection classes in the SF146C series include IP44. Models rated IP44 seal the motor against dust and splashing water for typical industrial environments; for outdoor or wash-down installations, choose the highest IP rating available in the series and avoid direct high-pressure water jets. The standard operating temperature range is -25 °C ~ +60 °C.

Q: How do I choose the right SF146C model?

Start from the airflow you need — the SF146C series covers 1150–1250 m³/h. In this series, DC models suit battery- and solar-powered systems. EC models offer stepless speed control and the best efficiency at partial load. The comparison table on this page lists airflow, voltage, power and noise for every model, or send us your operating point (airflow and static pressure) and our engineers will size the right model for you.

Q: What is the MOQ, lead time and sampling policy for SF146C fans?

Standard MOQ is 80 PCS per model, with a typical lead time of 25-30 days. Samples are available for evaluation before volume orders. OEM/ODM customization — private labels, connectors and speed curves — is supported at our Foshan factory.

Q: What are the main application areas of the 146 Dual inlet centrifugal fan?

The EC146 dual inlet centrifugal fan is a versatile air-moving solution for AHU, fresh air systems, data center cooling, medical devices, air purifiers, cold storage, EV chargers and industrial equipment. It delivers high static pressure, EC speed control, and compact, low noise operation.

Question 1

Why do manufacturers of high-end range hoods favor this EC146 Extractor blower?

Accepted Answer

The dual-inlet centrifugal fan is the correct choice for kitchen exhaust systems because it delivers approximately 40% more airflow at the same impeller diameter and speed, generates high static pressure to overcome the resistance of grease hoods, elbows, and fire dampers, reduces noise by 8-12 dB(A) compared to traditional single-inlet fans, and, with EC motors maintaining efficiency above 85% even under partial load, achieves energy savings of up to 70% compared to traditional AC motors while supporting 0-10V/PWM stepless speed control for "on-demand ventilation" based on grease concentration.

Question 2

What is an EC fan?

Accepted Answer

An EC fan is a fan that directly connects to an AC power source (such as 220V/50Hz or 115V/60Hz) and uses a built-in controller to convert AC to DC, then applies an electronic driver board to control motor winding current switching, replacing the mechanical commutation (carbon brushes) of traditional motors. Its working process is as follows:
1. Power supply: Directly connected to an AC power source (such as 220V/50Hz or 115V/60Hz), without the need for an external DC power supply or VFD.
2. Rectification: The built-in controller converts AC power to DC power.
3. Electronic commutation: With a built-in electronic driver board, the electronic circuit controls the current switching of the motor windings, replacing the mechanical commutation (carbon brushes) of traditional motors.
4. Speed control: Precisely adjusts the speed based on external control signals (0-10V, PWM, or Modbus).
5. Load efficiency: Maintains a flat, high-efficiency curve across the 10%-100% load range.
6. No carbon brush electromagnetic humming, and noise remains stable during speed adjustment; EC fans can achieve an additional 15%-35% energy savings within the typical 30%-70% operating range.

Question 3

How to select and match EC fans?

Accepted Answer

EC fan selection requires a systematic evaluation of the operating point, fan type, motor performance, control method, environmental protection, and installation dimensions, rather than simply "matching airflow." The following is a seven-step engineering selection process:

1. Determine the operating point (airflow + static pressure)
This is the foundation of selection. Never rely solely on the "free air flow" specification; both airflow and total system static pressure must be determined simultaneously.
Airflow calculation:
Sensible heat load method: Q (kW) = m × cp × ΔT, where cp = 1.006 kJ/kg·K (air)

Volumetric airflow: V (m³/h) = Q / (1.2 × 1.006 × ΔT) × 3600

Typical ΔT values: 10K for office HVAC, 12K for data center CRAH, 8K for residential

Static pressure calculation: At the design airflow, sum the pressure losses of all components:

System component  Typical static pressure range (Pa)
Filter	 50–250 (G4 clean 80Pa/dirty 250Pa; F7 clean 200Pa/dirty 400Pa)
Heating/cooling coil	100–400
Damper	30–100
Duct friction	200–500
Diffuser/terminal	50–150
Total static pressure = sum of all items × 1.1 (safety factor). A 10–15% static pressure margin must be reserved because resistance increases as filters accumulate dust.
2. Select the fan type
Choose the appropriate fan family based on the total system static pressure range:
Total static pressure (Pa)	Recommended fan type	Typical applications
< 400	EC axial fan	Condensers, dry coolers, large ventilation ducts
400–1,800	EC backward-curved centrifugal plug fan	AHU, CRAH, FFU, heat pumps, energy storage air conditioners
1,800–3,200	High-pressure EC plug fan	Liquid cooling units, dust collectors, high-density heat exchangers
For high-resistance complex ductwork, backward-curved centrifugal EC fans are most suitable; for high-airflow, low-resistance scenarios, EC axial fans can be selected; mixed-flow EC fans balance both airflow and static pressure requirements.
3. Use performance curves to determine fan size
Plot the calculated operating point (airflow + static pressure) on the PQ performance curve of candidate fans, and select the smallest high-efficiency size that covers this operating point. Data center fan walls commonly use Ø355–630mm, while compact models commonly use Ø133–310mm.
4. Calculate motor power
P (W) = (V × Pa) / (η × 1000), where V is in m³/s, Pa is total pressure, and η is fan efficiency; add a 10% margin to the result. The motor nameplate power should be ≥ calculated value × 1.1.
5. Determine the ingress protection rating (IP rating)
Select the IP rating based on the installation environment. Humid and dusty environments require IP55 or higher; cleanrooms and medical environments require consideration of corrosion resistance and easy-to-clean design.
6. Select the control method
EC fans support multiple control interfaces and must match your control system:

Control method	Features	Applicable scenarios
0-10V analog	Simple wiring, conventional wiring ≤50m	Building automation (BMS), simple speed control
4-20mA	Stronger interference immunity than 0-10V	Industrial environments
PWM	Suitable for embedded controllers	OEM equipment integration
Modbus RTU/RS485	Supports networked control, maximum wiring length 1000m, supports remote read/write of speed, current, and fault codes	Large-scale cluster management, data centers
7. Verify noise and installation dimensions
Confirm whether the noise limit meets project requirements (medical and educational scenarios are noise-sensitive), and check whether the fan's installation space dimensions match. The integrated design of EC fans eliminates the need for a separate VFD cabinet, saving installation space.

Question 4

Why does the EC146 double-inlet centrifugal fan with a plastic volute have such a wide range of applications in high-end range hoods, laminar flow beds/laminar flow canopies, and humidification and purification equipment?

Accepted Answer

The EC146 plastic volute dual-inlet centrifugal fan is widely used in high-end range hoods, laminar flow beds/laminar flow hoods, and humidification and purification equipment. Its core advantage lies in its precise balance of the demanding requirements these three scenarios place on the fan: achieving high airflow, high static pressure, low noise, and intelligent speed control simultaneously within a compact size. Its dual-inlet structure, EC motor, and the material properties of the plastic volute precisely address the core pain points in these applications one by one.

Question 5

Why are EC double inlet centrifugal blowers used in low-noise applications?

Accepted Answer

The EC146 dual-inlet centrifugal fan is widely used because it systematically resolves three key contradictions: its dual-inlet structure balances airflow and uniformity, its EC motor balances efficiency and controllability, and its plastic scroll housing balances cleanliness, corrosion resistance, and cost. This systematic balancing capability makes it an ideal choice for compact equipment with stringent requirements for performance, reliability, noise, and dimensions.

Question 6

How noisy is the SF146C series?

Accepted Answer

Rated noise across the SF146C series spans 60–65 dB(A) depending on model and size. Because noise follows speed, the easiest way to reduce sound levels is to choose a smaller model at a lower speed for the same airflow, or a speed-controlled EC/DC version where available — ideal for noise-sensitive environments such as offices, laboratories and residential ventilation.

Question 7

What bearings do SF146C fans use, and how long do they last?

Accepted Answer

Models in the SF146C series use NSK ball bearings, which supports continuous-duty operation in HVAC and industrial ventilation. Bearing life depends mainly on operating speed and temperature: keeping inlet air clean, avoiding vibration and running at moderate speeds maximise service life. For an L10 life estimate at your exact operating point, contact our engineering team.

Question 8

Are SF146C fans suitable for dusty or outdoor environments?

Accepted Answer

Protection classes in the SF146C series include IP44. Models rated IP44 seal the motor against dust and splashing water for typical industrial environments; for outdoor or wash-down installations, choose the highest IP rating available in the series and avoid direct high-pressure water jets. The standard operating temperature range is -25 °C ~ +60 °C.

Question 9

How do I choose the right SF146C model?

Accepted Answer

Start from the airflow you need — the SF146C series covers 1150–1250 m³/h. In this series, DC models suit battery- and solar-powered systems. EC models offer stepless speed control and the best efficiency at partial load. The comparison table on this page lists airflow, voltage, power and noise for every model, or send us your operating point (airflow and static pressure) and our engineers will size the right model for you.

Question 10

What is the MOQ, lead time and sampling policy for SF146C fans?

Accepted Answer

Standard MOQ is 80 PCS per model, with a typical lead time of 25-30 days. Samples are available for evaluation before volume orders. OEM/ODM customization — private labels, connectors and speed curves — is supported at our Foshan factory.

Question 11

What are the main application areas of the 146 Dual inlet centrifugal fan?

Accepted Answer

The EC146 dual inlet centrifugal fan is a versatile air-moving solution for AHU, fresh air systems, data center cooling, medical devices, air purifiers, cold storage, EV chargers and industrial equipment. It delivers high static pressure, EC speed control, and compact, low noise operation.

Question 12

What are the differences between the EC products of the SF146A Series and the SF146D Series?

Accepted Answer

The SF146A differs from the standard model in two main ways: 1. Different installation dimensions; 2. The housing of the SF146A product has the "Sunxfan" logo.

Question 13

Is this EC dual inlet extractor blower equipped with an EC motor with 4 speeds or 3 speeds? For the 4-speed version, are the speed values factory-set or user-adjustable?

Accepted Answer

This fan features an EC motor with 4 or 3 speed settings, and the speed value can be freely set by the user.

Question 14

What equipment or industries is this EC dual inlet centrifugal blower mainly used in?

Accepted Answer

HVAC equipment is the most core application area for these fans, which are widely used in Air Handling Units (AHU), Fan Coil Units (FCU), Variable Air Volume (VAV) terminal devices, Primary Air Units (PAU), and Fan Filter Units (FFU).

Question 15

What are the main application scenarios of wide-voltage EC double-inlet centrifugal blowers?

Accepted Answer

Wide-voltage EC dual-inlet centrifugal blowers are widely used in the following equipment due to their compact, high-pressure, and intelligent characteristics:

Application Field	Specific Equipment/Scenario
HVAC	Air Handling Units (AHU), Fan Coil Units (FCU), Fresh Air Systems, Air Curtains
Data Centers & IT	Server Cabinet Cooling, Precision Air Conditioning for Data Centers (CRAH/CRAC)
Energy & Power Electronics	Energy Storage Battery Cabinets, EV Charging Piles, PV Inverters, Industrial Control Cabinets
Medical & Laboratory	Medical Testing Equipment, Ventilators, Biosafety Cabinets, Precision Instrument Cooling
Commercial & Industrial	Commercial Refrigeration, Air Purifiers, Industrial Automation Equipment, Communication Equipment
Agriculture & Cultivation	Grow Tents, Greenhouse Ventilation, CO₂ Delivery