How do I know if the fan is dying?

Listen for clicking/grinding, check RPM via software for drops below spec, or manually spin blades for wobble/stiffness.

Can I connect the fan to the power supply?

Yes, using a PSU Molex connector runs it at full 12V speed, but motherboard headers allow for speed control.

404020mm Brushless Big Airflow Axial Flow Cooling DC Fan

Name: 40*40*20mm Brushless Big Airflow Axial Flow Cooling DC Fan
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2241800905

Shanghai, ChinaFengxia Motor (Shanghai) Co., Ltd.

40*40*20mm Brushless Big Airflow Axial Flow Cooling DC Fan

US$2.50-3.00

1 Piece

Sample price:US$2.50/piece.Request sample

Product profile

Customization

Available

Material

Aluminum Fan

Blade Material

PBT 94ulv

Model NO.

4020 DC Fan

Type

Axial Fan

Electric Current Type

Mounting

Free Standing

Certification

RoHS, ISO, CE

Transport Package

Paper Box

Specification

40*40*20mm

Origin

China

Production Capacity

100000 Pieces/Year

Key features

Wide Voltage Tolerance: Operates reliably within a 5V to 13V range, ensuring compatibility with various power sources.

Multiple Bearing Options: Choose from sleeve, hydraulic, or double-ball bearings for different noise and lifespan needs.

Dual Pin Compatibility: Supports both 3-pin DC control and 4-pin PWM for precise, automatic speed regulation.

Customization Services: Offers full customization from samples or designs, including OEM and ODM services.

International Certifications: Products certified with RoHS, ISO, CE, and FCC, ensuring high quality and safety standards.

Durable Aluminum Build: Constructed with aluminum fans and PBT 94ulv blades for stability and heat resistance.

Versatile Application: Suitable for PCs, automotive, medical equipment, and industrial control systems.

100% Quality Inspection: Every unit undergoes visual and functional inspection before shipping to ensure reliability.

Company profile

Importers and ExportersHigh Repeat Buyers Choice

Fengxia Motor (Shanghai) Co., Ltd.

Shanghai, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 5 Years CertifiedNearest Port: Shanghai PortAverage Response Time: ≤3.02h

AI-Powered supplier vetting

SummaryThe supplier demonstrates strong customization, R&D, OEM/ODM, quality-control, and complaint-handling capabilities. It reports new products within the past year, provides customization from samples and designs through full customization, and serves known brands through OEM. Production includes two lines, inventory capability, defined inspection procedures, and four QA/QC inspectors. However, important operational limitations exist: no available SDK, no overseas agents, branches, warehouse, or showroom, no offline trade-show participation, and only one experienced export-trade employee. Manufacturing controls also show gaps, including no ongoing quantity reconciliation for each batch and no standard operating procedure for outsourced manufacturing. Financial evidence is represented only by years rather than substantive indicators, so credibility cannot be determined. The supplier holds an ISO9001:2015 certificate, but the available information does not establish broader certification coverage.

Supplier typeThe supplier operates as a manufacturer with two production lines, provides OEM and ODM services, offers inventory capability, and accepts FOB and EXW quotations. It also provides full customization, but lacks overseas agents, branches, warehouses, and showrooms.

CertificationsThe supplier reports an ISO9001:2015 certificate. No additional specific certifications are identified in the provided information.

After-Sales capabilityThe supplier has documented and followed procedures for customer complaints and corrective/preventive actions, supporting an established service-response process. However, it has no overseas agents, branches, warehouse, or showroom, which limits demonstrated overseas service infrastructure.

R&D capabilityThe supplier reports new products in the past year, provides ODM services, and assigns R&D personnel to product development, design drawings, production support, and specifications. Nevertheless, it has no available SDK and no design input, output, review, validation, or confirmation documents available for audit.

Production capacityProduction evidence includes two production lines, inventory capability, one-month average lead times in both peak and off-season periods, four QA/QC inspectors, written finished-product inspection instructions, and multiple listed production machines. Controls are weakened by the absence of ongoing batch quantity reconciliation and a standard operating procedure for outsourced manufacturing.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, and full customization, with the same capability reported under both R&D and design services. This directly demonstrates broad customization coverage.

Product Q&A

Q:How can I reduce fan noise?

Use rubber grommets to reduce vibration, lower RPM via BIOS, or use a low-noise adapter to drop voltage.

Q:What is the difference between 3-pin and 4-pin fans?

3-pin uses DC voltage control with fixed speeds, while 4-pin uses PWM for automatic, precise, and quieter speed adjustment.

Q:How long does the fan last?

Sleeve bearings last ~2-3 years, hydraulic ~4-5 years, and double-ball bearings last 5-10 years under 24/7 use.

Q:Which direction should the fan face?

Follow the arrows on the frame: intake (cool air in) is usually front/side, and exhaust (hot air out) is rear/top.

Q:Why does the fan spin at 5V if labeled 12V?

Most motors have a wide tolerance (5V-13V) and can run at lower voltages, though they may not start below ~7V.

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404020mm Brushless Big Airflow Axial Flow Cooling DC Fan